A population's standard deviation is 12. We want to estimate the population mean with a margin of error of 3, with a 90% level of confidence.

Exercise 9-19 (Algo) (LO9-4) A population's standard deviation is 12. We want to estimate the population mean with a margin of error of 3, with a 90% level of confidence. How large a sample is required? (Round your intermediate calculations to 2 decimal places and round up your answer to the next whole number.) Sample required is