The p-value for the given mentioned test, with the test static of -2.01 is calculated out to be 0.0456.
To calculate the p-value for this test, we first need to determine the appropriate null and alternative hypotheses.
Null hypothesis: The proportion of customers who wait longer than 5 minutes at the drive-through for this franchise is equal to the national value of 12%.
Alternative hypothesis: The proportion of customers who wait longer than 5 minutes at the drive-through for this franchise differs from the national value of 12%.
We can use a two-tailed Z-test to test this hypothesis, with a significance level of alpha = 0.05.
The test statistic is given as -2.01. Since this is a two-tailed test, we need to find the area in both tails of the standard normal distribution that is at least as extreme as the test statistic.
Using a standard normal distribution table or a calculator, we find that the area to the left of -2.01 is 0.0228. The area to the right of 2.01 is also 0.0228. Therefore, the total p-value is the sum of these two probabilities:
p-value = 0.0228 + 0.0228 = 0.0456
Therefore, the p-value for this test is 0.0456. This means that there is a 4.56% chance of obtaining a test statistic as extreme as -2.01, assuming that the null hypothesis is true. Since the p-value is less than the significance level of 0.05, we reject the null hypothesis and conclude that the proportion of customers who wait longer than 5 minutes at the drive-through for this franchise differs from the national value of 12%.
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ANSWER QUICK ILL GIVE BRAINLIEST
(1.) What is the height of the cannon before it is launched, at t=0? Remember to include units.
(2.) A projectile's maximum height is shown by the vertex of the parabola. When does the cannonball reach its maximum height? Round to the nearest whole number and remember to include units.
(3.) What is the maximum height of the cannonball? Round to the nearest whole number and remember to include units.
(4.) How long does it take the cannonball to land on the ground? Round your answer to the nearest whole number and remember to include your units.
(5.) What would the equation be if the initial velocity was changed to 40.5 m/s but the initial height stays the same?
Answer:
1) 70 meters
2) at 3 seconds
3) about 114 meters
[tex]h(3) = - 4.9 ({3}^{2} ) + 29.4(3)+ 70 = 114.1[/tex]
4) about 8 seconds
5)
[tex]h(t) = - 4.9 {t}^{2} + 40.5t + 70[/tex]
what is (56 3/4+ 1 3/8)+ 1 1/5
Answer:
(56 3/4 + 1 3/8) + 1 1/5 = 58 + 23/5 = 293/5 or 58.6
Step-by-step explanation:
The sum of (56 3/4 + 1 3/8) + 1 1/5 can be calculated as follows:
First, we need to add the whole numbers:
56 + 1 + 1 = 58
Next, we add the fractions:
3/4 + 3/8 = (6/8) + (3/8) = 9/8
We can simplify this fraction by dividing both the numerator and denominator by their greatest common factor, which is 1:
9/8 ÷ 1/8 = 9
Finally, we add the last fraction:
9 + 1/5 = (45/5) + (1/5) = 46/5
Again, we can simplify this fraction by dividing both the numerator and denominator by their greatest common factor, which is 2:
46/5 ÷ 2/2 = 23/5
4.44 a company produces a computer battery that it claims last for 8 hours on a single charge with a standard deviation of 20 minutes. a random sampling of seven batteries are tested and found to have a sample standard deviation of 29 minutes. what is the chi-squared value and the predicted level of significance as represented by the test?
In order to determine the chi-squared value and the predicted level of significance as represented by the test, we need to conduct a hypothesis test. We will use the chi-squared test for a population variance. The null hypothesis is that the population variance is equal to 20 minutes squared (the square of the standard deviation), and the alternative hypothesis is that the population variance is greater than 20 minutes squared.
Therefore, the chi-squared value is calculated as:χ2 = (n - 1) × s2 / σ20where n is the sample size, s is the sample standard deviation, and σ0 is the hypothesized population standard deviation. Substituting the values given in the question, we get:χ2 = (7 - 1) × 29² / 20²= 21.19.
The degrees of freedom for this test are df = n - 1 = 6.Using a chi-squared distribution table with 6 degrees of freedom, we can find the predicted level of significance. For a chi-squared value of 21.19 and 6 degrees of freedom, the level of significance is less than 0.005. Therefore, we reject the null hypothesis and conclude that there is sufficient evidence to support the claim that the population variance is greater than 20 minutes squared.
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What is the value of x, given that the two prisms are similar?
A
5
OA. 40
OB. 30
O C. 10
OD. 20
20
8
9
10
The value of x is 40 given that the two prisms are similar.
How to find the value of x?If the two prisms are comparable, then their corresponding sides will be proportionately the same.
x / 20 = 10 / 5
x/ 20 = 2
x = 2 * 20
x = 40
Therefore, the value of x is 40 given that the two prisms are similar.
What is a prisms?A prism is a geometric shape that has two parallel and congruent bases that are connected by a set of rectangular or parallelogram faces. When light enters a prism, it is refracted, or bent, due to the different angles of the surfaces of the prism.
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the question lack some information.
See more detail of the question on the attached image.
find the number of integers between 2000 and 5000 which no digit is repeated if the integers are divisible by 5
Answer:
Step-by-step explanation:
a fitness center is interested in finding a 90% confidence interval for the mean number of days per week that americans who are members of a fitness club go to their fitness center. records of 220 randomly selected members were looked at and their mean number of visits per week was 2.4 and the standard deviation was 2.1. find the 90% confidence interval. group of answer choices (2.032, 2.768) (2.166, 2.634) (2.167, 2.638)
The 90% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center is (2.166, 2.634). So, the correct option is B).
To find the 90% confidence interval for the mean number of days per week that Americans who are members of a fitness club go to their fitness center, we can use the formula:
CI = X ± z*(σ/√n)
where X is the sample mean, σ is the sample standard deviation, n is the sample size, and z is the z-score associated with the desired confidence level (90% in this case).
The z-score for a 90% confidence level is 1.645.
Plugging in the values given in the problem, we get:
CI = 2.4 ± 1.645*(2.1/√220)
Solving this equation gives us a confidence interval of (2.166, 2.634) rounded to three decimal places.
Therefore, the correct answer is (2.166, 2.634) and option is B).
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at the market, each lb of Parmesan cheese is divided into 1/8 lb portions how many portions do they get from a 4-pound block cheese 4 lb?
They can get 32 portions of 1/8 lb each from a 4-pound block of Parmesan cheese.
To determine how many portions can be made from a 4-pound block of Parmesan cheese at the market, follow these steps:
1. Identify the size of each portion: 1/8 lb
2. Identify the total weight of the cheese block: 4 lb
3. Divide the total weight by the portion size to find the number of portions:
4 lb ÷ 1/8 lb
To do this division, you can multiply 4 by the reciprocal of 1/8 (which is 8/1):
4 × 8/1 = 32.
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Solve this system. -3x-y=10, 3x+y=-8 Somone answer this ASAP i need to turn in tonight.
Answer:
No solutions
Step-by-step explanation:
- 3x - y = 10 ⇒ ( 1 )
3x + y = - 8 ⇒ ( 2 )
( 1 ) + ( 2 )
-3x - y + 3x + y = 10 - 8
Combine like terms.
0 ≠ 2
NO solutions
Select all of the following that are quadratic equations. 5 x 2+ 15 x = 0 6 x - 1 = 4 x + 7 x 2 - 4 x = 4 x + 7 2 x - 1 = 0 3 x 2 + 5 x - 7 = 0 x 3 - 2 x 2 + 1 = 0
The equations that are quadratic functions are 6 x - 1 = 4 x + 7 x^2 and x^2 + 5 x - 7 = 0
The quadratic equation is an equation of the form:
ax^2 + bx + c = 0
where a, b, and c are constants, and x is the variable.
Out of the given equations, the following are quadratic equations:
6 x - 1 = 4 x + 7 x^2
x^2 + 5x - 7 = 0
The other equations are not quadratic equations:
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help please i don’t want to fail
Answer:
B) Decay
Step-by-step explanation:
This is a decay function because if you look at the number being raised to the power of t it is (1-0.43) meaning that the factor is less than 1, and numbers less than 1 result in a decay function. Whereas function that have a rate of 1 of more will be growth.
Which is true about triangles ABC and DEF? Which is true about triangles ABC and DEF? The triangles are congruent because The triangles are similar because The triangles are similar because The triangles are congruent because
The truth of ΔABC and ΔDEF is that both triangles i.e. ΔABC and ΔDEF are similar because[tex]\frac{12-6}{4-2} = \frac{27-15}{9-5}[/tex],So the correct option is Option(D).
What is a triangle?A three-sided polygon with three corners is termed as triangle.
This is the simplest polygon produced when three non-collinear points are connected by line segments.
Triangles can be classified according to the length of sides and size of the angles. There are several triangles that are as :
Scalene triangle: A triangle without equal sides.
isosceles triangle: A triangle with tow equal and same sides.
ΔABC and ΔDEF are similar because:-
[tex]\frac{12-6}{4-2} = \frac{27-15}{9-5}[/tex]
[tex]\frac{6}{2} = \frac{12}{4}[/tex]
3 = 3
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The complete question is :-
5/6 es mayor o menor que 5/2?
Answer:
5/2 es mayor que 5/6
Step-by-step explanation:
your welcome :D
the following data set represents the dollar amounts of donations collected at the entrance to a free museum during one hour. donation amount ($) frequency 1 1 5 5 10 3 15 1 600 1 is the median a reasonably good measure of central tendency for this data set? what if the outlier were removed from consideration?
Since, distribution is skewed right even after we remove the outlier (600) from the data set. The median is a good measure regardless of whether the outlier is included.
We have a data set represents the dollar amounts of donations collected at the entrance to a free museum during one hour. The data present in above figure. Now, first we determine the median. As we know, median of a data set is equals to the middle value of data set, so sometimes it is called middle value. It is the value which separates upper and lower halves of data sample or population etc. First we ordered the data values in ascending order. In case odd number of data values, median = middle value and in case of even number of terms, median = mean of two middle terms. Now, here data values in ascending order are 1,5,5,5,5,5,10,10,10,15,600. That is total data values = 11 ( odd) , so median
= 6th value = 5.
So, regardless of whether the outlier is included median is good measure in this situation.
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please help me with this Pythagoras theorem question
Pythagoras theorem is the square of two sides gives the square of third side.
Given,
Height of flagpole= 25 ft
base= 5 ft
Let the broken part be x
The remaining part becomes 25-x
Apply Pythagoras theorem
[tex]5^{2}[/tex] + [tex]x^{2}[/tex] = [tex](25-x)^{2}[/tex]
25 + [tex]x^{2}[/tex] = [tex]25^{2}[/tex] + [tex]x^{2}[/tex] - 2*25*x
25 + [tex]x^{2}[/tex] = 625 + [tex]x^{2}[/tex] - 50x
([tex]x^{2}[/tex] cancels out on both side)
50x = 625- 25
50x = 600
x = 600/50
x = 12
What is the value of the expression
m + (7.9)
when m= 2.5 and n = 5?
The value of the expression m + (7.9) is 10.4. when m= 2.5 and n = 5
Evaluating the expression for m and nfrom the question, we have the following parameters that can be used in our computation:
m + (7.9)
The expression m + (7.9) means that we need to add the value of m to 7.9.
Substituting m = 2.5, we get:
m + (7.9) = 2.5 + 7.9 = 10.4
Therefore, when m = 2.5, the value of the expression m + (7.9) is 10.4.
Note that the value of n is not used in this expression since it is not included in the expression to be evaluated.
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For each of the figures write an absolute value equation that has the following solution set.
Absolute value equation for a straight horizontal line with marked points and x-axis intercepts. Therefore, the absolute value equation that has the given solution set is:y + 1 = | x + 3 | .
How to write an absolute value equation that has the following solution set?
To find the absolute value equation that corresponds to the given solution set, we need to determine the axis of symmetry of the V-shaped graph formed by the absolute value function. The axis of symmetry is the vertical line that passes through the vertex of the graph. Since the vertex of the graph is located at the midpoint of the two given points, which is at x = -3, the axis of symmetry is x = -3.
The equation of the absolute value function can be written as:
b + | x - a |
= y
where a is the x-coordinate of the vertex and b is the y-coordinate of the point where the graph intersects the y-axis. In this case, the y-coordinate of the point where the graph intersects the y-axis is -1, so we have b = -1.
Substituting the value of a and b in the equation above, we get:
| x - (-3) | - 1 = y
Simplifying the equation, we get:
y + 1 = | x + 3 |
Therefore, the absolute value equation that has the given solution set is:
y + 1 = | x + 3 | .
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The area of the shaded region is 56π in2. Find the width of the shaded region.
The answer of the given question based on circle is , the width of the shaded region is 4 inches, and the answer is (a).
What is Radius?Radius is distance from center of circle to any point on circle. It is a fixed length and is the same for all points on the circle. The radius is usually denoted by the letter "r".
The radius is an important parameter of a circle and is used in many geometric calculations, like finding the circumference, area, diameter, chord length, and arc length of a circle. The diameter of a circle is twice the radius, and the circumference of a circle is equal to 2π times the radius.
The area of shaded region is equal to area of the outer circle minus area of inner circle. We are given that the area of the shaded region is 56π in², and the radius of the inner circle is 5 in.
Let radius of outer circle be " r ". Then we have:
Area of the shaded region = Area of the outer circle - Area of the inner circle
56π = πr² - π(5²)
56π = π(r² - 25)
r² - 25 = 56
r² = 81
r = 9
So, the radius of the outer circle is 9 inches.
The width of the shaded region is the difference between the radius of the outer circle and the radius of the inner circle:
Width of shaded region = 9 in - 5 in = 4 in
Therefore, the width of the shaded region is 4 inches, and the answer is (a).
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Try It
Complete the square.
y²-20y
Find the missing term that completes the square.
y²-20y +
(Simplify your answer. Type an integer or a fraction.)
we can represent this as a trinomial with a perfect square:(y-10)²-100
PRECISE SQUARE TERMINAL: WHAT IS IT?
A quadratic expression that can be factored into a binomial squared is a perfect square trinomial. When it is factored, it follows a pattern where the first and last terms are monomial perfect squares and the middle term is the product of the first two. A given trinomial is not a perfect square trinomial if the pattern does not fit for it1.
For instance, the trinomial x2+6x+9 is a perfect square trinomial since it factors into (x+3)². The square of x is represented by the first term, x², and the square of 3 by the last term, 9. Its result 2(x)(3) is twice as long as the middle term 6x.
Y has a coefficient of -20. A fraction of -20 is -10.
-10 is squared to give 100.
As a result, we can add and take 100 to finish the square.
It is necessary to add and subtract the square of the y-half coefficient's in order to finish the square for y²–20y.
y²-20y+100-100
=(y-10)²-100
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IK THE PIC IS DARK BUT I DESPERATELY NEED HELP PLEASE HELP ME THIS IS URGENT I WILL GIVE BRAINLIEST
Answer:
x = 4
Step-by-step explanation:
kane randomly sampled 250 nurses from urban areas and 250 from nonurban areas from a roster of licensed nurses in florida to study their attitudes toward evidence-based practice. what type of sampling is this?
The sampling technique used in this scenario is stratified random sampling.
This is because Kane grouped the population of licensed nurses in Florida into two distinct strata, namely urban and nonurban areas, based on a specific characteristic (geographical location). Then, he randomly selected 250 nurses from each stratum, resulting in a total sample size of 500 nurses.
The purpose of stratified random sampling is to ensure that the sample is representative of the population by including participants from each stratum in proportion to their representation in the population. This allows for more accurate and precise estimates of population parameters than simple random sampling, especially when there are significant differences between strata.
By stratifying the population and randomly selecting participants from each stratum, Kane can draw more reliable conclusions about the attitudes of licensed nurses toward evidence-based practice in urban and nonurban areas of Florida.
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find the answer (2√x) × (3³√x)
Answer:
6x^(3/2)
Step-by-step explanation:
To simplify the expression (2√x) × (3³√x), we can first use the properties of exponents to rewrite the cube root as a fractional exponent:
3³√x = x^(1/3)^3 = x^(1)
Using this, we can rewrite the expression as:
(2√x) × (3³√x) = 2x^(1/2) × 3x^(1)
To multiply these two terms, we can add the exponents since the bases are the same:
2x^(1/2) × 3x^(1) = 6x^(1/2 + 1) = 6x^(3/2)
Therefore, the simplified expression is 6x^(3/2).
Please help me with this I’m struggling please thanks so much
Answer:
41cm
Step-by-step explanation:
If observed closely you can see that perimeter C is the merged factor of both perimeter A and B.
To get the perimeter of C, merge both perimeter A and B together
The height will be 10cm
The bottom will be 6cm seeing as the top of perimeter A is 6cm and there are the same length
The top will be 6+7 = 13cm because perimeter A and B have been merged meaning they will be added
The right side will be 5cm because 5cm is the side of perimeter B
The long bottom will be 7cm because it is the same as perimeter B and they have the same length meaning
10+6+13+5+7 = 41cm(The answer is not squared because we only added the sides not multiplied it)
how many positive odd integers less than 1000 can be formed from the digits 0, 1, 2, 3, 4, 5, and 6?
There are 90 positive odd integers less than 1000 that can be formed from the digits 0, 1, 2, 3, 4, 5, and 6 by choosing any of the three odd digits as the last digit, and any of the remaining digits for the first and second positions.
To form a positive odd integer, the last digit must be an odd number, i.e., 1, 3, 5. For each of these three possible last digits, we can choose any of the remaining six digits for the first position, and any of the remaining five digits for the second position (since we cannot repeat digits in forming a positive integer).
Therefore, the total number of positive odd integers less than 1000 that can be formed from the digits 0, 1, 2, 3, 4, 5, and 6 is:
3 × 6 × 5 = 90
So there are 90 positive odd integers less than 1000 that can be formed from the given digits.
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A triangle has its height of 12 cm and hypotenuse of 15 cm. Find its base.
the magnitude of earthquakes recorded in a region of north america can be modeled as having an exponential distribution with mean 2.4, as measured on the richter scale. find the probability that an earthquake striking this region will exceed 3.0 on the richter scale. .368 find the probability that an earthquake striking this region will fall between 2.0 and 3.0 on the richter scale. .285 of the next ten earthquakes to strike this region, what is the probability that at least one will exceed 5.0 on the richter scale? .867
The probability that at least one of the next ten earthquakes to strike this region will exceed 5.0 on the Richter scale is approximately 0.867.
To solve this problem, we need to use the cumulative distribution function (CDF) of the exponential distribution.
Let X be the magnitude of earthquakes in this region, and [tex]X ~ exp(1/2.4).[/tex]
To find the probability that an earthquake striking this region will exceed 3.0 on the Richter scale, we need to calculate P(X > 3).
[tex]P(X > 3) = 1 - P(X ≤ 3)\\= 1 - F(3) (where F is the CDF of X)\\= 1 - (1 - e^(-3/2.4))\\= e^(-1.25)[/tex]
≈ 0.286
Therefore, the probability that an earthquake striking this region will exceed 3.0 on the Richter scale is approximately 0.286.
To find the probability that an earthquake striking this region will fall between 2.0 and 3.0 on the Richter scale, we need to calculate P(2 < X ≤ 3).
[tex]P(2 < X ≤ 3) = F(3) - F(2)= (1 - e^(-3/2.4)) - (1 - e^(-2/2.4))[/tex]
≈ 0.285
Therefore, the probability that an earthquake struck this region will fall between 2.0 and 3.0 on the Richter scale is approximately 0.285.
To find the probability that at least one of the next ten earthquakes to strike this region will exceed 5.0 on the Richter scale, we need to use the complement rule and the fact that the number of earthquakes is a Poisson distribution with mean 10/2.4 = 4.17. Let Y be the number of earthquakes that exceed 5.0 on the Richter scale.
[tex]P(Y ≥ 1) = 1 - P(Y = 0)\\= 1 - e^(-4.17) * (4.17^0 / 0!)[/tex]
≈ 0.867
Therefore, the probability that at least one of the next ten earthquakes to strike this region will exceed 5.0 on the Richter scale is approximately 0.867.
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find the value of x.
Answer:
x = 55°
Step-by-step explanation:
Inscribed Angle Theorem says that the angle inside the circle is equal to 0.5 times the measurement of the arc it span. For example, the 70° spans 140° of the arc.
Create two equations to solve for x and r.
x = 0.5r
2r + 2(70) = 360
2r + 140 = 360
2r = 220
r = 110
x = 0.5 * 110
x = 55°
"I NEED HELP PLS" The following figure is made of 1 triangle and 2 rectangles. Find the area of each part of the figure and the whole figure. Figure Area (square units) Rectangle A Triangle B Rectangle C Whole figure
The area of each part of the figure and the whole figure is Rectangle A = 15 square units
Triangle B = 6 square units
Rectangle C = 8 square units
Whole figure = 29 square units
To find the area of each part of the figure, we need to use the formula for the area of a rectangle and the area of a triangle.
Let's start with Rectangle A. We can see from the figure that its length is 5 units and its width is 3 units. To find its area, we use the formula A = l x w, where A represents the area, l represents the length, and w represents the width. So, for Rectangle A, we have:
A = 5 x 3 = 15 square units
Next, let's move on to Triangle B. We can see from the figure that the base of the triangle is 4 units and the height is 3 units. To find its area, we use the formula A = (1/2) x b x h, where A represents the area, b represents the base, and h represents the height. So, for Triangle B, we have:
A = (1/2) x 4 x 3 = 6 square units
Finally, let's find the area of Rectangle C. We can see from the figure that its length is 4 units and its width is 2 units. To find its area, we use the same formula as for Rectangle A:
A = 4 x 2 = 8 square units
Now that we have the area of each part, we can add them up to find the whole figure. So, we have:
Whole figure = Rectangle A + Triangle B + Rectangle C
Whole figure = 15 + 6 + 8
Whole figure = 29 square units
Therefore, The area of each part of the figure and the whole figure are as follows:
Rectangle A = 15 square units
Triangle B = 6 square units
Rectangle C = 8 square units
Whole figure = 29 square units
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Find the area of the regular polygon below. Leave your answer in simplest radical form.
(help me I'm so lost...)
The area of the regular polygon is [tex]49\sqrt3[/tex] square unit.
What is area?
The region that an object's shape defines as its area. The area of a figure or any other two-dimensional geometric shape in a plane is how much space it occupies.
Here the given triangle ,
Apothem a = [tex]\frac{7\sqrt3}{3}[/tex]
Now side length s = [tex]2\sqrt3 a[/tex]
=> side length s = [tex]2\sqrt3\times \frac{7\sqrt3}{3} = \frac{14\times3}{3}[/tex] = 14
Now area of equilateral triangle A = [tex]\frac{\sqrt3 s^2}{4}[/tex] square unit.
=> A = [tex]\frac{\sqrt3\times14^2}{4}[/tex] = [tex]49\sqrt3[/tex] square unit.
Hence the area of the regular polygon is [tex]49\sqrt3[/tex] square unit.
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how large a sample should be selected to provide a 95% confidence interval with a margin of error of 3? assume that the population standard deviation is 50. round your answer to next whole number.
The sample size required to provide a 95% confidence interval with a margin of error of 3, assuming a population standard deviation of 50, is approximately 106.
To calculate the sample size needed for a confidence interval, we use the formula:
n = (Z² × σ²) / E²
where:
n = sample size
Z = Z-value (corresponding to the desired confidence level)
σ = population standard deviation
E = margin of error
For a 95% confidence interval, the Z-value is 1.96. Plugging in the values, we get:
n = (1.96² × 50²) / 3²
n = 3841 / 9
n = 426.78
Since we need a whole number, we round up to the nearest integer, giving us a sample size of 107.
Therefore, the sample size required to provide a 95% confidence interval with a margin of error of 3, assuming a population standard deviation of 50, is approximately 106.
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the postsurgery survival time of a breast cancer patient is normally distributed with a mean of eight years and a standard deviation of 1.5 years. find the probabilities that a woman with breast cancer will survive after her surgery: g
The probability that a woman with breast cancer will survive after her surgery is less than -1.33 is approximately 0.0918.
Therefore P(X < 6) = 0.0918 or 9.18%.
To find the probability that a woman with breast cancer will survive after surgery, we need to use the normal distribution formula.
z = (x - μ) / σ
where z =z-score
x=survival time in years,
μ =mean survival time,
and σ= standard deviation of survival time.
Let X be the survival time, then [tex]X ~ N(8, 1.5^2).[/tex]
a) 10+ year survival probability:
I would like to find P(X > 10). Using the formula above, we get:
z = (10 - 8) / 1.5 = 1.33
A standard normal distribution table or calculator tells us that the probability that z is greater than 1.33 is approximately 0.0918.
Therefore P(X > 10) = 0.0918 or 9.18%. b) 5- to 7-year survival probabilities:
b) 5- to 7-year survival probabilities: I would like to find P(5 < X < 7).
Using the formula above, we get: z1 = (5 - 8) / 1.5 = -2
z2 = (7 - 8) / 1.5 = -0.67
From a standard normal distribution table or calculator, we know that the
probability that z is between -2 and -0.67 is approximately 0.1841.
Therefore P(5 < X < 7) = 0.1841 or 18.41%.
c) Probability of survival <6 years:
Find P(X < 6). Using the formula above, we get:
z = (6 - 8) / 1.5 = -1.33
A standard normal distribution table or calculator tells us that the probability that z is less than -1.33 is approximately 0.0918. Therefore P(X < 6) = 0.0918 or 9.18%.
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