Exhibit 7-5
Random Samples of Size 17 Are Taken from a Population

Short Answer

Exhibit 7-5
Random samples of size 17 are taken from a population that has 200 elements, a mean of 36, and a standard deviation of 8.
-The average weekly earnings of bus drivers in a city are $950 (that is $\mu$ ) with a standard deviation of $45 (that is $\sigma$ ). Assume that we select a random sample of 81 bus drivers.
a.Assume the number of bus drivers in the city is large compared to the sample size. Compute the standard error of the mean.
b.What is the probability that the sample mean will be greater than $960?
c.If the population of bus drivers consisted of 400 drivers, what would be the standard error of the mean?