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  3. suppose 400 students take an exam and the distribu

Suppose 400 students take an exam and the distribution of their scores can be treated as...

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Statistics

Suppose 400 students take an exam and the distribution of theirscores can be treated as normal. Find the number of scores fallinginto each of the following ranges:

(a)   Within 1 standarddeviation of the mean.

(b)  Within 2 standarddeviations of the mean.

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