22. In 2016, the average fee paid by customers for tax returns was $187. Assume that the standard deviation of fees was $60 but that we have no idea regarding the shape of the population distribution. What's the mean of the sample means of randomly selected samples of 40 customer?

21. In 2016 the average fee paid nu customers was $110. Assume that the standard deviation of fees was $57 but that we have no idea regarding the shape of the population distribution. What's the standard deviation of the sample means of randomly selected samples of 40 customers? provide the answer as a fraction of three decimal places