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21.35 Averages versus individuals. Scores on the ACT college entrance examination vary Normally with mean a = 18 and standard deviation cr = 6. The

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21.35 Averages versus individuals. Scores on the ACT college entrance examination vary Normally with mean a = 18 and standard deviation cr = 6. The range of reported scores is 1 to 36. a. What range contains the middle 95% of all individual scores? b. If the ACT scores of 50 randomly selected students are averaged, what range contains the middle 95% of the averages E

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