The bar pictures show the quiz scores of the members of a Class 7A group and a Class 7B group. Which group has the higher mean score, and by how much?

Question

Accepted Answer

7A, by 1 mark. 7A: 6+9+7+10/4 = 32/4 = 8 . 7B: 8+5+9+7+6/5 = 35/5 = 7 . 7B has the bigger total only because it has more members; 7A's mean is higher by 8 - 7 = 1 mark.

The bar pictures show the quiz scores of the members of a Class $7 A$ group and a Class $7 B$ group. Which group has the higher mean score, and by how much?

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