Please help with the following:

You are interested in finding a 90% confidence interval for the average commute that non- residential students have to their college. The data below show the number of commute miles for 13 randomly selected non-residential college students. Round answers to 3 decimal places where possible. 17 8 25 26 9 12 23 11 6 14 19 16 21 a. With 90% confidence the population mean commute for non-residential college students is between and miles. b. If many groups of 13 randomly selected non-residential college students are surveyed, then a different confidence interval would be produced from each group. About percent of these confidence intervals will contain the true population mean number of commute miles