Based on a national study (N = 1,500), we find that the mean years of education for adults is 13.77 with a standard deviation of 3.07. Assuming that years of education is normally distributed please provide the following:

What is the percentage of people we would expect to be between +2 and -2 standard deviations and approximately how many people would this be in this sample?

The percentage of people we would expect to have 12 years of education or less and approximately how many people would this be in this sample?