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Scores on the ACT test are normally distributed with a mean of 21.1 and a standard deviation of 4.8. If one ACT score is randomly selected, find the probability that it is greater than 20.
14 years ago

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TutorCat
Find the z-score.
http://www.ehow.com/how_4555631_calculate-zscore-statistics.html

Then look up the p value on the z table.
14 years ago

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