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**