Refer to Exercise 2.3 and the data on the number of extracurricular activities in which 30 students participated in the past week. These data have
n = 30  = 1.925 s = 1.607 activities
(a) Obtain a 98% confidence interval for μ, the population mean number of activities.
(b) In a long series of experiments, each involving different students, what proportion of the intervals would cover μ?