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To test the efficacy of admissions or release an emergency

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To test the efficacy of admissions or release, an emergency room embarks on a controlled experiment. Each experiment consists of choosing 4 patients at randomon a particular night. The patients are selected from a group where the doctors are not certain whether they should be admitted or not. Name the patients P1, P2, P3, P4. Of these 4 patients, 2 are chosen at random. The first patient will be released and the second admitted.

(a) Display a tree diagram of the possible outcomes.

(b) Denote by A the event that at least one of the patients has an even numbered index (P2 and P4 have even numbered indices). Which outcomes are included in A?

(c) Suppose that P1 and P2 are over 50 years old and P3 and P4 are less than 40 years old. Denote by B the event that exactly one of the patients selectesd is over 50 years old. Which outcomes are included in B?

Reference no: EM13576395

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