Question

In: Statistics and Probability

A population has a mean of 50 and a standard deviation of 10. If a random...

A population has a mean of 50 and a standard deviation of 10. If a random sample of 36 is taken, what is the probability that the sample mean is each of the following?

a. Greater than 54

b. Less than 53

c. Less than 46

d. Between 48.5 and 52.5

e. Between 50.4 and 51.7

(Round the values of z to 2 decimal places. Round your answers to 4 decimal places.)

a. Upper P left-parenthesis x Overscript bar EndScripts greater-than 54 right-parenthesis =

b. Upper P left-parenthesis x Overscript bar EndScripts less-than 53 right-parenthesis =

c. Upper P left-parenthesis x Overscript bar EndScripts less-than 46 right-parenthesis =

d. Upper P left-parenthesis 48.5 less-than-or-equal-to x Overscript bar EndScripts less-than-or-equal-to 52.5 right-parenthesis =

e. Upper P left-parenthesis 50.4 less-than-or-equal-to x Overscript bar EndScripts less-than-or-equal-to 51.7 right-parenthesis =

Solutions

Expert Solution


Related Solutions

A Population has a mean of 50 and a standard deviation of 15. If a random...
A Population has a mean of 50 and a standard deviation of 15. If a random sample of 49 is taken, what is the probability that the sample mean is each of the following a. greater than 54 b. less than 52 c. less than 47 d. between 45.5 and 51.5 e. between 50.3 and 51.3
A population has a mean of 50 and a standard deviation of 19. If a random...
A population has a mean of 50 and a standard deviation of 19. If a random sample of 64 is taken, what is the probability that the sample mean is each of the following? a. Greater than 52 b. Less than 51 c. Less than 48 d. Between 46.5 and 53.5 e. Between 50.8 and 51.2
A population has a mean age of 50 years and a standard deviation equal to 10...
A population has a mean age of 50 years and a standard deviation equal to 10 years. To study the population, you decide to sample 36 individuals and measure their age. What is the probability that a sample mean age is between 47.5 and 52.5 years? Answer What is the probability of selecting a sample of 36 individuals that has a sample mean of 55 years or more? Answer What is the probability of selecting a sample of 36 individuals...
A population has a mean of 50 and a standard deviation of 5. A sample of...
A population has a mean of 50 and a standard deviation of 5. A sample of 100 observations will be taken. The probability that the mean from that sample will be between 49 and 51 is a)0.50 b)0.6826 c)0.8413 d)0.9544
A population has a mean of 400 and a standard deviation of 50. Suppose a sample...
A population has a mean of 400 and a standard deviation of 50. Suppose a sample of size 125 is selected and  is used to estimate . Use z-table. What is the probability that the sample mean will be within +/- 9 of the population mean (to 4 decimals)? (Round z value in intermediate calculations to 2 decimal places.)    What is the probability that the sample mean will be within +/- 10 of the population mean (to 4 decimals)? (Round...
A population has a mean of 200 and a standard deviation of 50. Suppose a sample...
A population has a mean of 200 and a standard deviation of 50. Suppose a sample of size 100 is selected and x-bar is used to estimate μ. What is the probability that the sample mean will be within ±15 of the population mean? State your answer as a decimal with 4 decimal places.
Given a random variable ? has population mean ? = 20 and standard deviation ? =...
Given a random variable ? has population mean ? = 20 and standard deviation ? = 5. a.) For the sampling distribution of the sample mean ?, for ? = 50 trials what are the mean and standard deviation? ??bar = _____________, ??bar =_____________. b.) What is the probability that the sample mean will be in the interval 19 < ?bar < 21 ? ?(19 < ? < 21) =_____________. (give answer to at least 4 signifiant figures.)
A random variable, X, has a population mean, µ = 155, and a population standard deviation,...
A random variable, X, has a population mean, µ = 155, and a population standard deviation, σ = 10. What is the probability that X is more than 180? Answer PART II. A random variable, X, has a population mean, µ = 155, and a population standard deviation, σ = 10. To study the population, a random sample of 64 observations is collected and data is recorded. What is the probability that a sample mean will exceed 180? Answer Using...
A population distribution of score has a mean = 100 and a standard deviation of 10....
A population distribution of score has a mean = 100 and a standard deviation of 10. Researchers plan to take a sample size of N=25. Based on the central limit theorem, 68.26% of all possible means are between the sample means of ______ A) 90 and 100 B) 95 and 100 C) 98 and 102 D) 97 and 103
1. A population random variable X has mean LaTeX: \mu=10μ = 10 and standard deviation LaTeX:...
1. A population random variable X has mean LaTeX: \mu=10μ = 10 and standard deviation LaTeX: \sigma=5σ = 5. Samples of size 36 are drawn with replacement. Find the probability that the sample mean LaTeX: \overline{X}X ¯ will be between 6.5 and 14, inclusive? 2. 52 percent of the voting population of a city favor candidate A for mayor. What is the probability that more than 51 percent will favor A in a random sample 50 voters from the city?
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT