Based on per capita consumption sales data, the average number of alcoholic drinks that Americans typically consume per week is 9 with a standard deviation of 2.4.

a) What percent of Americans typically consume an average of at least 7.8 alcoholic drinks per week if a sample of 37 Americans are chosen?

b) Find the proportion of Americans who consume and average of between 7.2 and 10.1 alcoholic drinks per week.Assume that a sample of 19 Americans is chosen and that the data is normally distributed.