GMAT
题目
Scores for graduates on a university exit exam are normally distributed with a mean of 75 and standard deviation of 10.
Quantity A
The probability that a score will be less than 55
Quantity B
The probability that a score will be greater than 95
解析
分数服从均值为75的正态分布。
分数55与95距离均值均为两个标准差，因此两者出现的概率相等。
答案：C
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