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GRE数学正态分布ArandomvariableYisnormallydistributedwithameanof200andastandarddeviationof10.比较theprobabilityoftheeventthatthevalueofYisgreaterthan220,与1/6.下面为答案解析:(有些看不明1-(50%

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GRE数学正态分布
A random variable Y is normally distributed with a mean of 200 and a standard deviation of 10.比较 the probability of the event that the value of Y is greater than 220,与 1/6.
下面为答案解析:(有些看不明 1-(50%+95%/2)
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答案和解析
在180--220的概率为大约95%,大于220的概率为(1-95%)/2=0.025