6. A patient takes a lab test and the result comes back either positive or negative. The test returns a correct positive result in 99% of the cases in which the disease is actually present, and a correct negative result in 98% of the cases in which the disease is not present. Furthermore,0.001 of all people have this cancer. (a) If a person is tested positive, what is the probability that this person has the cancer. (b) If a person takes two independent tests and both return positive results. What is the probability that this person has the cancer? (c) If a person takes two independent tests and only one returns positive result. What is the probability that this person has the cancer? 我的算法是： a). 0.1/100 x 99/100 =9.9/10000 b). (0.1/100 x 99/100)+(0.1/100 x 99/100) =19.8/10000 c). (0.1/100 x 99/100)+(0.1/100 x 2/100) = 10.1/10000 可以帮我看看我算的对不对吗 谢谢 -- ★ crazydog 好啊!! --

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