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April 20, 2014

Homework Help: statistics

Posted by christy on Thursday, February 2, 2012 at 10:24pm.

For a particular sample of 80 scores on a psychology exam, the following results were obtained.
First quartile = 65 Third quartile = 98 Standard deviation = 8 Range = 56
Mean = 83 Median = 81 Mode = 59 Midrange = 64
Answer each of the following:
I. What score was earned by more students than any other score? Why?
II. What was the highest score earned on the exam?
III. What was the lowest score earned on the exam?
IV. According to Chebyshev's Theorem, how many students scored between 67 and 99?
V. Assume that the distribution is normal. Based on the Empirical Rule, how many students scored between 67 and 99?
Please show all of your work

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