A set of quiz scores has a mean of 78 and a standard deviation of 9. Using a common grading scale where 60 and above is a passing score, what percentage of the

students passed this test?

Explain your answer in terms of the 68-95-99.7 rule.

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# A set of quiz scores has a mean of 78 and a standard deviation of 9. Using a common grading

A set of quiz scores has a mean of 78 and a standard deviation of 9. Using a common grading scale where 60 and above is a passing score, what percentage of the

students passed this test?

Explain your answer in terms of the 68-95-99.7 rule.