2. The mean wage per hour for all employees who work at a large company is $25.50 with a standard deviation of $6.75. Let ??̅be the mean wage per hour for a random sample of certain employees selected...

2. The mean wage per hour for all employees who work at a large company is $25.50 with a standard deviation of $6.75. Let ??̅be the mean wage per hour for a random sample of certain employees selected from this company. Find the mean and standard deviation of ??̅ for the following sample sizes:

a) n=12

??̅ =

??̅ =

b) n=30

??̅ =

??̅ =

c) n=100

??̅ =

??̅ =

What happens to the values of ????̅ and ????̅ as the sample size increase?