是不是应该先求出xbar的期望值和标准差,然后利用 a=（xbar-期望值）/标准差为标准正态分布来计算那个概率,这期间可能利用了大数定律和中心极限定理.仅供参考.
一道大学统计题A random sample of size n=24 is taken from a distribu
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