If the population standard deviation for the average loss was 16 tons per acre, determine the margin of error for estimating the mean loss per acre

If the population standard deviation for the average loss was 16 tons per acre, determine the margin of error for estimating the mean loss per acre for a confidence level of 95% for sample sizes of farmers ranging from 289, 324 and 361. What would be your recommendation to the local Farm Bureau for estimating the average loss of production per acre, given the data you have at hand?