新GRE数学重要考点:Conditional

发布时间:

各个击破新GRE数学重要考点,今天小编为大家整理的是Conditional相关的内容。

Conditional

Probability of event A conditioned on the fact that event B has happened is called the conditional probability and written as P(AIB).

P(AIB)=Probability Both A and B happens/ Probability B happens.

Example:

A six-sided die with faces from 1 to 6 is rolled twice. What is the probability that the face 5 turned up on first try given that the sum of the two faces is 9?

P(sum of faces is 9)=4/36=1/9.

P(face 5 turns up on the first try and sum is 9)=(1/6)*(1/6)=1/36.

P(face 5 turned up on first try given sum is 9)=(1/36)*(1/9)=1/4.

Remember:

If P(AIB)=P(A),then two events A and B are independent, that is occurrence of one does not influence the other

最新单词

词汇分类
高中词汇CET4词汇CET6词汇TOEFL词汇IELTS词汇GRE词汇考研词汇
首字母索引
ABCDEFGHIJKLMNOPQRSTUVWXYZ

本站部份资料来自网络或由网友提供,如有问题请速与我们联系,我们将立即处理!

版权所有©四级英语单词   网站地图 陇ICP备2023000160号-4

免责声明:本站非营利性站点,以方便网友为主,仅供学习。