The test scores for a class have a normal distribution, a mean of

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The test scores for a class have a normal distribution, a mean of 50, and a standard deviation of 4.

Quantity A

Percentage of scores at or above 58

Quantity B

Percentage of scores at or below 42

A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.

答案：C

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