Several psychology students are unprepared for a surprisetrue/false test with 10 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 7 correctanswers)? Why or whynot?

a. = (Do notround.)

= (Round to one decimal place asneeded.)

b. Choose the correct answer below.

A. Yes, because 7 is below the minimum usual value

B. No, because 7 is within the range of the usual values

C. Yes, because 7 is within the range of the usual values

D. Yes, because 7 is greater than the maximum usual value

(Choose one.)