University bookstores order books thatinstructors adopt for their courses. The numberof copies…

University bookstores order books thatinstructors adopt for their courses. The numberof copies ordered matches the projected demand.However, at the end of the semester, the bookstorehas too many copies on hand and must return themto the publisher. A bookstore has a policy that theproportion of books returned should be kept assmall as possible. The average is supposed to beless than10%. To see whether the policy is work-ing, a random sample of book titles was drawn, andthe fraction of the total originally ordered that arereturned is recorded and listed here. Can we inferat the10% significance level that the mean propor-tion of returns is less than 10%?41511759435