Question: Smith and Jones each write the same multiple-choice test. The test has 5 questions, and each question has 5 answers (exactly one of which is

Smith and Jones each write the same multiple-choice test. The test has 5 questions, and each question has 5 answers (exactly one of which is right). Smith and Jones are not very well prepared for the test and they answer the questions randomly. What are the mean and standard deviation number of questions that Smith answer correctly?

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