9.16 Consider Exercise 9.10, the problem from the photo below, Compute the 95% prediction interval for the next observed number of wordsschool.per minute typed by a graduate of the secretarial

9.10 A random sample of 12 graduates of a certain secretarial school typed an average of 79.3 words per minute with a standard deviation of 7.8 words per minute. Assuming a normal distribution for the num- ber of words typed per minute, find a 95% confidence interval for the average number of words typed by all graduates of this school