You have been hired as the Media Librarian for the Johnson City Public Library and the Associate Director tells you that they are thinking of reducing the lending period for books on tape from the current 21 days. You are asked for your input, so you take a random sample of 48 of the titles and obtain the duration in days that each was checked out the last time. The results are:

9,9,10,10,10,10,12,12,12,12,12,12,12,13,13,13,13,13,13,14,14,14,14,14,14,14,14,14,14, 15,15,15,15,15,15,15,18,18,18,18,19,19,20,22,22,23,23,24

1. Find the mean, mode, median, and standard deviation. (I understand this step).

2. What percentage of items circulate between 11.06 and 15.57 days? Use normal curve and estimate.

3. If these sample items represent the population and the lending period was reduced to 14 days, what percent of the circulation would be impacted?