A hat contains 100 coins where at least 99 are fair but


Problem: CONDITIONING AND EVIDENCE

A hat contains 100 coins, where at least 99 are fair, but there may be one that is double-headed (always landing Heads); if there is no such coin, then all 100 are fair. Let D be the event that there is such a coin, and suppose that P(D) = 1/2. A coin is chosen uniformly at random. The chosen coin is ?ipped 7 times, and it lands Heads all 7 times.

(a) Given this information, what is the probability that one of the coins is doubleheaded?

(b) Given this information, what is the probability that the chosen coin is doubleheaded?

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Basic Statistics: A hat contains 100 coins where at least 99 are fair but
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