F.6-F.7statistic! probability!

👨🏻‍🏫 學術台數學

yanyan

2008-04-09 7:11 am

A box A contains 9 red balls and 1 white ball. A box B contains 8 red balls and 1 white ball. A ball in to be taken at random from box A and put into box B,and then a ball is to be taken at random from box B.
Of the 2 balls drawn, 1 from A and 1 from B, let X denote the number that
are white.
Find the probability distribution of X.

更新1:

我朋友教左我 x= 1 1/10* 8/10+ 9/10*1/10= 17/10 而用呢個黎計E (x) 係岩架,因為e (x)係0.21

回答 (1)

myisland8132

2008-04-09 7:22 pm

✔ 最佳答案

It is obviously that the possible of X is 0,1,2

P(X=0)
=(9/10)(9/10)
=81/100

P(X=1)
=(1/10)(9/10)+(9/10)(1/10)
=18/100

P(X=2)
=(1/10)(1/10)
=1/100

the probability distribution of X.
X 0 1 2
p 81/100 18/100 1/100

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收錄日期: 2021-04-25 16:58:24
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