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OpenStudy (anonymous):
Scores on a test have a mean of 66 and Q3 is 80. The scores have a distribution that is approximately normal. Find the standard deviation. Round your answer to the nearest tenth. A. 10.5 B. 20.9 C. 18.7 D. 9.4
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OpenStudy (perl):
Q3 corresponds to the 75th percentile
OpenStudy (perl):
we can use the z score formula
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