Correct option is A
Given:
Percentage marks of boys = 80, 80, 40, 90, 70, 70
Percentage marks of girls = 60, 70, 60, 60, 80, 60
Formula Used:
Average = Number of termsSum of terms
Solution:
Average % marks of boys = 680+80+40+90+70+70≈71.67
Average % marks of girls = 660+70+60+60+80+60=65
Difference = 71.67 - 65 = 6.67