查看完整版本 : Maths probility 求救

雨中濃濃的山頭 2016-12-17 01:11 AM

Maths probility 求救

The prob that a bolt is faulty is 0.133
1.Find the prob of taking more than 2 faulty bolts if 24 bolts are picked?
2.How many bolts should be picked to be more than 94.7% sure of taking at least 1 faulty bolt?
3.From 1 packet of 11 bolts,find the prob that not more than 3 are faulty.
4.From 1 packet of 36 bolts,find the prob that no.of faulty bolts is prime and<10.
5.From 2 packets of 21each,find the prob that both contains faulty bolts with a total of 4.

雲艾法比 2016-12-19 02:15 AM

1.binomial
2.probability of no faulty bolt is less than 1-0.947
3.binomial
4.no of faulty is 3 or 5 or 7
5.easy
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查看完整版本: Maths probility 求救