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3. A doctor is seeking an anti-depressant for a newly diagnosed patient. Suppose that of the available anti-depressant drugs,
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Answer #1

The probability that any particular drug will be effective for a particular patient= p= 0.6

Expected value E(X)= q/p

Expected number of drugs that will be tried to find one that is effective=q/p= 0.4/0.6=0.67

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