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If all the exam questions have a choice of 4 different responses (a,b,c,d) what is the probability of randomly guessing the right answer? How does

If all the exam questions have a choice of 4 different responses (a,b,c,d) what is the probability of randomly guessing the right answer?

How does this relate to the formulas regarding probability? For example, if the probability of a correct answer was .25, what would the mean (aka expected value) of the distribution be if the sample size was 100?

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