问题描述：
random variable X is normally distributed,with a mean of 25 and a standard deviation of 4.
Which of the following is cloest to the inter-quartile range for this distribution?
A 25-22.3=2.7 B 27.7-22.3=5.4 C 27.7/22.3=1.24 D 2(4)=8 E 37-13=24
Which of the following is cloest to the inter-quartile range for this distribution?
A 25-22.3=2.7 B 27.7-22.3=5.4 C 27.7/22.3=1.24 D 2(4)=8 E 37-13=24
问题解答：
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