The graph given below shows the number of boys and girls in 7 different schools in a year.
Which of the following statement is correct?
I. The ratio of the number of boys in school S2 to the number of girls in school S2 is 5 : 1.
II. The average of the number of boys in school S4, S5 and S6 is 500.
III. The difference between the number of boys and girls in all the 7 schools is 200.
1
I, II and III
2
II and III
3
। and II
4
I and III