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OpenStudy (anonymous):
Assume a data set is normally distributed with mean 115 and standard deviation 15. If the data set contains 400 data values, approximately how many of the data values will fall within the range 85 to 145?
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OpenStudy (anonymous):
Look at the normal curve and find the % of data between 2 standard deviations below the mean and 3 standard deviations above the mean; take that % and multiply that by 400.
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