A random variable Y is normally distributed with a mean of 200 and a standard deviation of 10.
Quantity A Quantity B
The probability of the event 1/6 that the value of Y is greater than 220
这个可以复习下那个正态分布的图了，OG294面。220对应的就是mean+两个标准差了，那么220以下的比例是(50+34+14)%了，在220以上的就是1减去前面这个数，比1/6要小。B
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