Steelman, Powell, and Carini (2000) explored the relationship between teacher unions and student educational performance as measured by standardized tests, such as the American College Testing exam (ACT). Use the ACT statistics shown here to answer the following questions. The distribution is normally shaped.

Mean = 22 ACT scores; standard deviation = 2; n = 441,574 students.

QUESTION:

Determine the score below which 90 percent of the scores fell - that is, 90% of the students scored below the score that you need to report.