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18 March, 23:11

The A. P. Statistics exam consists of a multiple-choice section where each question has five choices. Sara estimates that she has a 75% chance of knowing each question. If she does not know the answer, she will randomly guess.

a) What is the probability of Sara getting a question correct?

b) The A. P. exam has 40 questions, how many might Sara expect to get correct?

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  1. 19 March, 02:54
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    It's more than 75% because if she knows it that's 75% already, then you add 20% of the 25% she didn't know.

    That's. 20 •.25 = 0.05 or 5%.

    She actually has an 80% chance.

    Then 0.80 • 40
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