问题标题:
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%
问题描述:
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%+95%/2)
孙新岸回答:
在180--220的概率为大约95%,大于220的概率为(1-95%)/2=0.025
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