*9.2.43 Question Help People were polled on how many books they read the previous year. Initial survey results indicate that s = 12.1 books. Complete parts (a) through (d) below. la 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 four books with 90% confidence? pic This 90% confidence level requires subjects. (Round up to the nearest subject.) wa c p als in m Is I p ills I and inter tand luals uniqu ild be sion fo e and me in s emot e I have