Several anthropology students are unprepared for a surprise true/false test with 19 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.)
μ=\displaystyle \mu=

Find the standard deviation for the number of correct answers for such students.
(Round answer to two decimal places.)
σ=\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 12 correct answers?