For numbers 6-8, consider the following data:

6. What is the range of the given data?
A. 18
B. 41
C. 24
D. 23

7. What is the computed class interval if given 8 is the desired?
A. 1
B. 2
C. 3
D. 4

8. What are the class limits of the first class?
A. 18 - 20
B. 18 - 21
C. 18 - 19
D. 19 - 21

9. What is the class mark of the fourth class?
A. 19.5
B. 23.5
C. 27.5
D. 31.5

10. What is the frequency of the first class?
A. 1
B. 2
C. 5
D. 4 ​