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OpenStudy (anonymous):
in a study of 82 video game players, the researchers found that the ages of these players were normally distributed, with a mean age of 17 years and a standard deviation of 3 years. determine if their were 15 video game players in this study over the age of 20. justify your answer
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Directrix (directrix):
No. Over 20 is more than 1 standard deviation above the mean. 0.159 * 82 = 13.038 approx
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