Mathematics

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19 March, 02:30

A problem on a multiple-choice quiz is answered correctly with probability 0.9 if a student is prepared. an unprepared student guesses between 4 possible answers, so the probability of choosing the right answer is 1/4. seventy-five percent of students prepare for the quiz. if mr. x gives a correct answer to this problem, what is the chance that he did not prepare for the quiz?

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