In a certain community, 8% of all adult over 50 have diabetes. If a health service in this community correctly diagnoses 95% of all persons with diabetes as having the disease and incorrectly diagnoses 2% of all persons without diabetes as having the disease, find the probabilities that a.the community health service will diagnose an adult over 50 as having diabetes. b.a person over 50 dianosed by the health service as having diabetes actually has the disease. 我的作法是a.0.08*0.95+0.92*0.02 b.(0.08*0.95)/(0.08*0.95+0.92*0.02) 不知道有沒有錯誤~感謝~~~^^ --

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