Question: In a certain distribution, the mean is 40 with a standard deviation of 5. At least what fraction of the numbers are between the following

In a certain distribution, the mean is 40 with a standard

$deviation of 5. At least what fraction of the numbers are between$

In a certain distribution, the mean is 40 with a standard deviation of 5. At least what fraction of the numbers are between the following pair of numbers? 25 and 55

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