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A test consists of 850 true or false questions. If the student guesses on each question, what is the mean number of correct answers? A) 850 B) 170 C) 425 D) 0

User Jdelange
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Final answer:

The mean number of correct answers when guessing on each question is 425.

Step-by-step explanation:

To find the mean number of correct answers when guessing on true or false questions, we can use the formula for the mean of a binomial distribution.

The probability of getting a question correct by guessing is 0.5 (since there are two options: true or false). So the mean number of correct answers is equal to the total number of questions multiplied by the probability of getting a question correct:

Mean number of correct answers = 850 x 0.5 = 425

Therefore, the mean number of correct answers when guessing on each question is 425.

User Fred Laurent
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