Consider the digits in the phone numbers on a randomly selected page of your local phone book a population. Make a frequency table of the final digit of 30 randomly selected phone numbers. For example, if a phone number is 555-9704, record a 4.

a. Draw a histogram or other graph of this population distribution. Using the uniform dis- tribution, compute the population mean and the population standard deviation.

b. Also record the sample mean of the final four digits (9704 would lead to a mean of 5). Now draw a histogram or other graph showing the distribution of the sample means. c. Compare the shapes of the two histograms.