Question: The exam score has normal distribution. 2 . 5 % of class failed and 1 6 % of class gor A . A is the

The exam score has normal distribution. 2.5% of class failed and 16% of class gor A. A is the highest grade, 86 or above qualifies an A. Using 68-95-99.7% rule, what is the mean of this normal distribution?

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