The Essentials of Statistics 3rd Edition by Joseph Healey

Exercise 5

At St. Algebra College, the 200 freshmen enrolled in introductory biology took a final exam on which their mean score was 72 and the standard deviation was 6. The following table presents the grades of 10 students. Convert each into a Z score and determine the number of people who scored higher or lower than each of the 10 students. (Hint: Multiply the appropriate proportion by N and round the result.)