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Assume that a set of test scores is normally distributed with a mean of 100 and...

Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the​ 68-95-99.7 rule to find the following quantities. a. The percentage of scores less than 100 is . ​(Round to one decimal place as​ needed.) b. The percentage of scores greater than 120 . ​(Round to one decimal place as​ needed.) c. The percentage of scores between 60 and 120 is nothing​%. ​(Round to one decimal place as​ needed.)

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Use the​ 68-95-99.7 rule

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