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OpenStudy (anonymous):
The scores of a high school entrance exam are approximately normally distributed with a given mean mc023-1.jpg = 82.4 and standard deviation mc023-2.jpg = 3.3. What percentage of the scores are between 75.8 and 89?
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OpenStudy (kropot72):
Note that the scores 75.8 and 89 are both 2 Standard Deviations from the mean. Therefore you can use the empirical rule to find the required percentage.
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