Assuming that the Exam-1 scores of STA 2023 students are normally distributed with mean 80 inches and standard deviation 2 inches a) How many

Assuming that the Exam-1 scores of STA 2023 students are normally distributed with mean 80 inches and standard deviation 2 inches

a) How many students in a class of 40 are expected to score higher than 84?

b) What percentage of students would have scored between 78 and 84 points?