Find probability that answers are at least half correctly

Reference no: EM13123494

Richard has just been given a 10-question multiple-choice quiz in his history class. Each question has four answers, of which only one is correct. Since Richard has not attended class recently, he doesn't know any of the answers. Assuming that Richard guesses on all ten questions, what is the probability he answers at least half correctly?

Reference no: EM13123494

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