Several Psychology Students Are Unprepared For A Surprise​ True/False Test With 16 ​Questions And All Of

Several psychology students are unprepared for a surprise true/false test with 16 questions, and all of their answers are guesses
a. Find the mean and standard deviation for the number of correct answers for such students.
b. Would it be unusual for a student to pass by guessing (which requires getting at least 11 correct answers)? Why or why not?
a. u =
(Do not round.)Statistics and Probability