单选题Matt and Alysia are going to get their driver's licenses. The probability that Matt passes his driving test is 9/10. The probability that Alysia passes her driving test is 7/9. Assuming that their result is not dependent on how the other does, what is the probability that Matt passes and Alysia fails?A101/90B1/5C7/10D11/90E27/100
单选题
Matt and Alysia are going to get their driver's licenses. The probability that Matt passes his driving test is 9/10. The probability that Alysia passes her driving test is 7/9. Assuming that their result is not dependent on how the other does, what is the probability that Matt passes and Alysia fails?
A
101/90
B
1/5
C
7/10
D
11/90
E
27/100
参考解析
解析：
The two events are independent. The probability that Alysia fails the test is 1- 7/9 = 2/9 The probability that Matt passes and Alysia fails is (9/10)×(2/9) =2/10=1/5
The two events are independent. The probability that Alysia fails the test is 1- 7/9 = 2/9 The probability that Matt passes and Alysia fails is (9/10)×(2/9) =2/10=1/5
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