Several psychology students are unprepared for a surprise true/false test with 18 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 15 correct answers)? Why or why not?
a. mu equals
(Do not round.)
sigma equals
(Round to one decimal place as needed.)
b. Choose the correct answer below.
A.
Yes comma because 15 is greater than the maximum usual value.
B.
Yes, because 15 is within the range of usual values.
C.
No comma because 15 is within the range of usual values.
D.
Yes comma because 15 is below the minimum usual value.
1 answer