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What is the mean quiz score

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Reference no: EM131083798

A class is taking a test that consists of 20 true/false questions. The instructor made a mistake and printed the quiz for a much more advanced class. The students don't know any of the content and they randomly guess at every question without event reading them.

A. Explain why this is a binomial random variable.

B. What are the values of the parameters n and p?

C. What is the mean quiz score?

D. What is the standard deviation of the quiz scores?

E. In order to pass, a student needs to get 12 or more questions correct. What is the probability that a student will get 12 or more questions correct?

F. In order to get an A, a student needs to get 18 or more questions correct. What is the probability that a student will get 18 or more questions correct?

G. What is the probability that a student will get all 20 questions correct?

Reference no: EM131083798

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