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小王爱学习 · 2022年01月27日

不太分的请大于等于、大于、小于、小于等于

NO.PZ2019040801000073

问题如下:

Robin Hill is taking a difficult multiple choice exam. There are 5 questions in the exam and each question has four choices. The choices are almost the same in each question. which of the following amouts is closest to the probability that he will get more than 3 questions correct by randomly guessing ? 

选项:

A.

3.0%.

B.

8.79%.

C.

1.56%.

D.

25.0%.

解释:

C is correct.

考点:二项分布概率计算

解析:二项分布中答对一题概率是25%,5道题,

正确4道,5道的可能性分别是:

P(4) = 5 x (0.25)4 x (0.75)1= 0.0146484

P(5) = 1x (0.25)5x (0.75)0 = 0.0009766

0.01464 + 0.00098  = 1.562%

老师,是否可以列举,less than、fewer than, more than。哪个是大于等于,小于等于,小于、大于,这几个表示?

1 个答案
已采纳答案

李坏_品职助教 · 2022年01月27日

嗨,爱思考的PZer你好:


less是用来修饰不可数名词的,比如less water。fewer是用来修饰可数名词的,比如fewer people。


less than和fewer than都是小于的意思,more than是大于。


大于等于是more than or equal to。

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NO.PZ2019040801000073问题如下Robin Hill is taking a fficult multiple choiexam. There are 5 questions in the exaneaquestion hfour choices. The choices are almost the same in eaquestion. whiof the following amouts is closest to the probability thhe will get more th3 questions correranmly guessing ? A.3.0%.B.8.79%.C.1.56%.25.0%.C is correct.考点二项分布概率计算解析二项分布中答对一题概率是25%,5道题,正确4道,5道的可能性分别是P(4) = 5 x (0.25)4 x (0.75)1= 0.0146484P(5) = 1x (0.25)5x (0.75)0 = 0.00097660.01464 + 0.00098 = 1.562%老师好,我这么做哪里错了吗?

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