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For a particular sample of 50 scores on a psychology exam, the following results were obtained.

First quartile = 67 Third quartile = 91 Standard deviation = 9 Range = 48
Mean = 75 Median = 80 Mode = 81 Midrange = 74

a)What score was earned by more students than any other score? Why?
b)How many students scored between 67 and 91 on the exam?
c)What was the highest score earned on the exam?
d)What was the lowest score earned on the exam?
e)How many students scored within three standard deviations of the mean (/x±3s)?

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Solution Summary

The solution examines the standard deviation for a psychology exam.

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5. For a particular sample of 50 scores on a psychology exam, the following results were obtained.
First quartile = 67 Third quartile = 91 Standard deviation = 9 Range = 48
Mean = 75 Median = 80 Mode = 81 Midrange = 74

a)What score was earned by more students than any other score? Why?
b)How many students scored between 67 and 91 on the exam? ...

Purchase this Solution
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