please solve this

A poll is to be conducted to nd out how many books. on ayerage. Canadians read. You are the person who is to select a random sample and to ask the people of the sample about the number of books they read in the previous year. How.r many people are needed for your sample to estimate the number of books within 3 books with 90% condence? Assume that it is known that the standard deyiation for number of books read by Canadians is 12.}r books