math

Suppose the scores of students on an exam are normally distributed with a mean of 393 and a standard deviation of 57. According to the empirical rule, what percentage of students scored between 279 and 507 on the exam

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  1. Don't know what the "empirical rule" is, but in real normal distribution calculations, I got
    95.45%

    http://davidmlane.com/normal.html

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