Suppose the distribution of cholesterol levels for male undergraduates is approximately normal with mean 190 mg/dl and standard deviation 40 mg/dl. Suppose you take a sample 49 cholesterol level readings from this population.
(a) What is the population of the study?
(b) What is the probability of selecting someone at random from this population who has a cholesterol value less than 180?
(c) What is the mean and the standard deviation (error) of ?
(d) What is the probability the mean cholesterol a level is less than 180?