Posted by **terry** on Monday, July 19, 2010 at 6:48pm.

Assume that a set of test scores is normally distributed with a mean of 100 and a standard devaiton of 20. Use the 68-95-99.7 rule to find the following quantities:

a. percentages of scores less than 100

b. relative frequency of scores less than 120

c.percentage of scores less than 140

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