Health statistics

Richard has been given a 5-question multiple-choice quiz in his history class. Each question has three answers, of which only one is correct. Since Richard has not attended the class recently, he doesn’t know any of the answers. Assuming that Richard guesses on all 5 questions in this binomial experiment, find the number of questions he can expect to answer correctly.
A) All five questions.
B) No questions.
C) Three questions.
D) Between one and two questions.
E) None of these

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