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- anonymous

Nathan had an infection, and his doctor wanted him to take penicillin. Because Nathan’s father and paternal grandfather were allergic to penicillin, Nathan had a 75% chance of having the same allergy. The doctor performed a skin test to see whether Nathan would react to it. The test is 98% accurate. What is the probability that Nathan is allergic to penicillin and the test predicts it?
0.005
0.015
0.245
0.735

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- cwrw238

the 2 probabilities mentioned here are with regard to the allergy and the accuracy of the test . These are independent of each other so in combination they are multiplied.

- cwrw238

so we have 0.75 and 0.98

- anonymous

so 0.735

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- cwrw238

correct

- anonymous

Thank you so much! Your are a life saver.

- cwrw238

welcome

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