probability?
回答 (1)
2016-11-07 12:08 pm
✔ 最佳答案
(a)P( red marble )
= P( Box A ∩ red marble ) + P( Box B ∩ red marble ) + P( Box C ∩ red marble )
= (1/3)(6/14) + (1/3)(7/14) + (1/3)(12/21)
= 0.5 ..... Ans
(b)
P( Box C｜blue marble )
= P( Box C ∩ blue marble ) / P( blue marble )
= (1/3)(9/21) / ( 1 - 0.5 )
= 2 / 7 ..... Ans
收錄日期: 2021-04-18 15:48:12
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https://hk.answers.yahoo.com/question/index?qid=20161106072219AAr2L0g