Yoonie is a personnel manager in a large corporation. each month she must review 16 of the employees. from past experience, she has found that the reviews take her approximately 4 hours each to do with a population standard deviation of 1.6 hours. let x be the random variable representing the time it takes her to complete one review. assume x is normally distributed. let x be the random variable representing the mean time to complete the 16 reviews. assume that the 16 reviews represent a random set of reviews. find the probability that the mean of a month's reviews will take yoonie from 3.6 to 4.2 hrs.