The data below show a sample of grades of students on their final exam in a statistics class.

Grades
67
64
63
84
73
83
85
78
76
65
62
69
66
70
77


a) Find the average final exam grades for this class.
[Round your answer to two decimal places.]

The mean of midterm exam for the class was 82.13. Did the students tend to perform better on their final exam or midterm exam?
Select an answer


b) Find the sample standard deviation of the final exam grades.
[Round your answer to two decimal places.]

The standard deviation of the midterm grades was 5.93. Did the student's final grades tend to have more or less variation than their midterm grades?
Select an answer