Question

following is the distribution of marks of 50 students

Answer 1

1)10
2)40
3)class mark=20+30/2=50/2=25
class mark=25
4)class mark=10+20/2=30/2=15
class mark =15
5)10

Answer 2

Step-by-step explanation:

5. class width = upper class boundary ÷2 - lower class boundary ÷ 2

20+20/2 = 20

30+30/2 30

30-20= 10