随机变量X服从正态分布N(0,1)，若X落在区间（-2，-1）和（1，2）_爱下问搜题

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问题选择题

随机变量X服从正态分布N(0,1)，若X落在区间（-2，-1）和（1，2）上取值的概率分别为p₁、p₂,则

A．p₁>p₂

B．p₁<p₂

C．p₁=p₂

D．不确定

答案

答案：C

填空题

认真思考，根据句意，填内容。

例: I can't find my pen.

My pen is lost.

1. You can't find book.

book is lost.

2. She can't find bag.

bag is lost.

3. He can't find bicycle.

bicycle is lost.

名词解释

肿瘤坏死因子（tumornecrosisfactor，TNF）