Score: 0 of 8 pts 10 of 13 (9 complete) HW Score: 54.43%, 54.4 9.2.43 Question H People were polled on how many books they read the previous year. Initial survey results indicate that s = 19.9 books. Complete parts (a) through (d) below Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 90% confidence? This 90% confidence level requires subjects. (Round up to the nearest subject.) Question Viewer Enter your answer in the answer boy