there are 10 boxes of wine glasses in a factory,each box contains 20 glasses and only 1 glass in these 10 boxes is defective,a customer randomly chooses
1 box and randomly checks 4 of glasses inside,if he finds no defective glasses,he buys the box of glasses,find probability that customer buys box of glasses
f5數學題一問?10點
2011-09-24 7:10 am
回答 (1)
2011-09-24 7:40 am
✔ 最佳答案
P(he buys the box of glasses)＝P(he choose a box that has no defective glasses)+P(he choose the box containing the defective glass and doesn't find the defective glass)
＝9/10+(1/10)(19/20)(18/19)(17/18)(16/17)
＝9/10 +(1/10)(16/20)
=9/10+16/200
=(180+16)/200
=186/200
希望幫到你！
2011-09-24 09:00:21 補充：
對不起，應該是196/200
=49/50
收錄日期: 2021-04-11 18:45:55
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110923000051KK00859