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28. Total cholesterol levels are assumed to follow a normal distribution for males and females in specific age groups (e.g., 20-39, 40-59). The following parameters are available on total cholesterol levels for patients enrolled in a particular HMO: Gender, Age Group Mean Standard Deviation Female, 30-49 185 28 Male, 30-49 192 24 a. What proportion of females 30-49 years of age has total cholesterol levels exceeding 200? b. What proportion of males 30-49 years of age has total cholesterol levels exceeding 200? c. Compute the 90th percentile of total cholesterol levels among females 30-49 years of age. d. Compute the 90th percentile of total cholesterol levels among males 30-49 years of age. Add these exercises: (e) Compute the 10th percentile of females. (f) Compute the 10th percentile of males