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Average score of 3 boys in a class is 70 and average score of 7 girls in the class is 72. Find combined average of class. 
1. 65.8
2. 71.4
3. 70.5
4. 66

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Correct Answer - Option 2 : 71.4

Given:

Average score of 3 boys in a class is 70 and average score of 7 girls in the class is 72.

Formula Used:

Weighted average (A’) = [n1A1 + n2A2] / [n1 + n2]

Calculation:

Combined average of class = [3 × 70 + 7 × 72] / [3 + 7]

⇒ Combined average of class = 714/10 = 71.4

∴ Combined average of class is 71.4

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