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Probability of Correct Test Answers

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A True-False test has 20 questions with each having 2 possible answers with one correct answer. Assume a student answers every question.

a. What is the probability of getting exactly 9 correct answers?
b. What is the probability of getting less than 6 correct answers?

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This solution helps with probability questions.

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For each question, the probability that a student answer correctly is 1/2 and the probability that a student answer ...

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