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theprobabilitythatastandardnormallydistributedrandomvariablewillbemorethantwostandarddeviationsaboveitsmeanis()A0.0217B0.0228C0.4772D0.9772

题目详情
the probability that a standard normally distributed random variable will be more than two standard deviations above its mean is()
A 0.0217
B 0.0228
C 0.4772
D 0.9772
▼优质解答
答案和解析
一个服从标准正态分布的随机变量比其均值大2倍标准差的概率.
用数学符号来表示就是
N(0,1),求P(X>2)
查表得B