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Several economics students are unprepared for a surprise true/false test with 24 questions, and all of their answers are guesses. Find the mean for the number of correct answers for such students. (Round answer to one decimal place.) H = Find the standard deviation for the number of correct answers for such students. (Round answer to two decimal places.) 0 = Give the range for the usual number of correct answers. (Enter answer as an interval using square-brackets only with whole numbers.) usual values = Would it be unusual for a student to pass by guessing and getting at least 15 correct answers? yes, it would be unusual no, it would not be unusual