(Answered) People were polled on how many books they read the previous

Engineering

People were polled on how many books they read the previous year. How many subjects are needed to estimate the number of books read the previous year within one book with 99% confidence? Initial survey results indicate that sigma σ equals=12.9 books.

A 99 % confidence level requires how many subjects. ?(Round up to the nearest whole number as needed.)

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