Cholesterol The serum cholesterol levels of 50 subjects randomly selected from the L.A. Heart Data, data from an epidemiological heart disease study on Los Angeles County employees, 5 follow. 148 304...

Cholesterol
The serum cholesterol levels of 50 subjects randomly selected from the L.A. Heart Data, data from an epidemiological heart disease study on Los Angeles County employees,⁵
follow.

a. Construct a histogram for the data. Are the data approximately mound-shaped?

b. Use a t-distribution to construct a 95% confidence interval for the average serum cholesterol levels for L.A. County employees.