13. What is the total frequency?
A. 5
B. 25
C. 35
D. 38

14. What is the class interval?
A. 4
B. 5
C. 11
D. 20

15. What is the frequency of the lowest class?
A. 5
B. 8
C. 9
D. 11

16. Which class has the highest frequency?
A. 1-5
B. 6-10
C. 11-15
D. 16-20

17. Which is the upper limit of the 3rd class?
A. 5
B. 10
C. 15
D. 20

18. Which is the lower limit of the class with the highest frequency?
A. 6
B. 11
C. 16
D. 21

Please help me po, kailangan ko na po ito, please don't answer if you don't know the answer po, thank you in advance^ω^​