Almost all companies utilize some type of year-end performance review for their employees. human resources (hr) at a university's health science center provides guidelines for supervisors rating their subordinates. for example, raters are advised to examine their ratings for a tendency to be either too lenient or too harsh. according to hr, "if you have this tendency, consider using a normal distributionlong dash10% of employees (rated) exemplary, 20% distinguished, 40% competent, 20% marginal, and 10% unacceptable." suppose you are rating an employee's performance on a scale of 1 (lowest) to 100 (highest). also, assume the ratings follow a normal distribution with a mean of 54 and a standard deviation of 14. complete parts a and b. what is the lowest rating you should give to an exemplary employee if you follow the university? s hr guidelines?