Several economics students are unprepared for a surprise multiple-choice test with 14 questions, and all of their answers are guesses. Each question has three possible answers, and only one of them is correct.

Find the mean for the number of correct answers for such students.
(Round answer to one decimal place.)
$\displaystyle \mu=$

Find the standard deviation for the number of correct answers for such students.
(Round answer to two decimal places.)
$\displaystyle \sigma=$

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 9 correct answers?