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题目材料：
The figure shows a normal distribution with mean m and standard deviation d, including approximate percents of the distribution corresponding to the six regions shown.
The random variable W is normally distributed with mean $$50$$ and standard deviation $$9$$. Which of the following is closest to the value of W at the 25th percentile of the distribution?
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A.$$13$$
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B.$$17$$
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C.$$32$$
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D.$$44$$
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E.$$48$$
D显示答案
