初等考試統計 - 考試
By Lily
at 2016-01-02T13:51
at 2016-01-02T13:51
Table of Contents
[考題] 國考歷屆考題與考題觀念討論(書裡看到的選這個)請附上想法、出處
100 年的考題
A、B為兩獨立事件,若P(A|BC)=0.5,P(BC)=0.2,則P(A∩B)=?(BC為B之補集)
0.1
0.3
0.4
0.5
答案是0.4 但我一直覺得是0.3
因為我想 A|BC = A+ BC -A∩BC
所以 A-A∩BC = A|BC-BC =0.5-0.2=0.3
然後 A-A∩BC = A∩B
所以 A∩B = 0.3
這樣那裡是錯的呢?
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