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how to solve problems like Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of

how to solve problems like Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 5 Use the 68-95-99.7 rule to find the following quantities.

The percentage of scores less than 100 is ___?

ive tried checking my textbook and I cannot find any in-depth explanation.

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