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Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the68-95-99.7 rule to

Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the68-95-99.7 rule to find the following quantities.

a. The percentage of scores less than 100 is

b. The percentage of scores greater than 120 is?

c. The percentage of scores between 60 and 120 is?

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