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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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