24. In 2016, The average fee paid by customers for the 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 probability that a randomly selected group of 20 customers will yield a sample mean of less that $190? If the calculation cannot be performed, explain why the calculation cant be performed otherwise. Provide the aanswer as a fraction to three decimal places.

23. Employees in a large manufacturing plant worked an average of 62 hours of overtime last year, with a standard deviation of 15 hours. A histogram of overtime hours last year revealed a bell shaped distribution ( normal distribution)

What's the probability that a randomly selected group of 20 employees will yield a sample mean of more that 58 hours? if the calculation cannot be performed please enter 0 otherwise, provide the answer as a fraction of three decimal places