题目内容

The jacket was so_______ that he decided to buy it.

A. much
B. little
C. expensive
D. cheap

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Don't you think it ________ not to write the letter?

A. well
B. better
C. best
D. good

正态分布中，μ是位置参数，σ是形状参数。

A. 对
B. 错

设有正态总体μ=4.73，σ=2.63，如何转化成标准正态分布。

x~ N (μ, σ2 )，请问μ±σ，μ±2σ，μ±3σ，μ±1.96σ，μ±2.58σ范围内的概率是多少。