For item number 8-10. The data below shows the mass of 40 students in a class. The measurement is to the nearest kg.

Mass (kg)
45-49
50-54
55-59
60-64
65-69
70-74
75-79

Frequency
2
4
7
10
4
6
7

8. What is the range of the given data above?

a. 26
b. 28
c. 30
d. 34

9. What is the width of the class interval of the given data above?

a. 4
b. 5
c. 6
d. 7

10. What is is the total frequency of the given data?

a. 30
b. 35
c. 40
d. 50​