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

Question

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.
a. The percentage of scores less than 80 is%.
(Round to one decimal place as needed.)

Kunduz · Accepted Answer

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