Homework Help: stats

Posted by jeanette on Saturday, March 31, 2012 at 7:13pm.

a student randomly guesses at five multiple-choice questions, each question has five possible choices (suppose the choice for each question is independent): a) Find the probability that the student gets exactly three correct. b) What is the probability that the student gets all correct? c) What is the expected number of correct questions? d) Find the probability that the student gets at least the expected number of correct questions ?

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