In which class pass percentage of boys is more than the average pass percentage of girls of the school?

Average pass percentage of girls = Total number of girls for pass the class/7
Average pass percentage of girls = 80 + 80 + 40 + 90 + 80 + 50 + 70/7 = 490/7 = 70%
Therefore. in class VI pass percentage of boys is more than the average pass percentage of girls.