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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

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: What proportion of the scores fell between 18 and 23?

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