Two standard deviations below the mean would be 66 - 2*10 = 46.
Per the Empirical Rule 2.4% of the data is less than 2 SD below the mean.
William W.
asked • 02/21/21NEED MATH HELP FOR MATH204
The scores on a psychology exam were normally distributed with a mean of
66
and a standard deviation of
10.
A failing grade on the exam was anything 2 or more standard deviations below the mean. What was the cutoff for a failing score? Approximately what percentage of the students failed?
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