In a car rental company's fleet, 70% of the cars are American brands, 20% of Japanese, and the rest are German. The company notes that manufacturers' recalls seem to affect 2% of the American cars, but only 1% of the others.
a) What's the probability that a randomly chosen car is recalled?
b) What's the probability that a recalled car is American?
Statistics question...!!!!!?
2008-08-18 8:17 pm
回答 (2)
2008-08-18 8:26 pm
✔ 最佳答案
a) P (recall) = 0.7*0.02+ 0.2*0.01+ 0.1* 0.01= 0.017 = 1.7 % b) P (recall is American) = (0.02*0.7)/0.017= 0.8235= 82.35 %
hope this helps
2008-08-19 3:25 am
a.
70*2 + 30*1 = 100* x
x = 1.7%
b.
70*2/(70*2 +30*1) = 140/170 = 82.35%
70*2 + 30*1 = 100* x
x = 1.7%
b.
70*2/(70*2 +30*1) = 140/170 = 82.35%
收錄日期: 2021-04-25 13:54:19
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