Answer the following for the data of Exercise 12.11 (See below)

d. What fraction of programs make less then or equal to 25 I/O's and what is the 95% confidence interval for the fraction?

12.11 The number of disk I/O's performed by a number of programs were measured as follows { 23, 33, 14, 15, 42, 28, 33, 45, 23, 34, 39, 21, 36, 23, 34, 36, 25, 9, 11, 19, 35, 24, 31, 29, 16, 23, 34, 24, 38, 15, 13, 35, 28}.