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Assume that a set of test scores is normally distributed with a mean of 80 and...

Assume that a set of test scores is normally distributed with a mean of 80 and a standard deviation of 20. Use the​ 68-95-99.7 rule to find the following quantities.

The percentage of scores less than 80 is __%

The percentage of scores greater than 100 is _%

The percentage of scores between 40 and 100 is _%

Round to the nearest one decimal

Math   Statistics-And-Probability   
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