For item 6-10 refer to the data below. Choose the letter that corresponds to the best answer.

Class:
46-50
41-45
36-40
31-35
26-30
21-25
16-20
11-15
6-10
1-5

Frequency:
1
2
3
10
6
9
5
6
4
2

6. What is the class size?
a. 4
b. 3
c. 5
d. 6

7. What is the mean score?
a. 24.10
b. 24.29
c. 24.15
d. 24.39

8. What is the range of the given set of data?
a. 50
b. 50.5
c. 49.5
d. 99.5

9. What is the variance?
a. 119.59
b. 119.49
c. 119.40
d. 119.50

10. What is the standard deviation?
a. 10.90
b. 10.91
c. 10.92
d. 10.93​