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The average weight of a group of 14 members increases by 1.4 kg when a member weighing 72 kg joins the group. Find the average weight of 14 members.
1. 44
2. 48
3. 51
4. 55

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Correct Answer - Option 3 : 51

Given: The average weight of a group of 14 members increases by 1.4 kg when a member weighing 72 kg joins the group.

Formula: Average of n numbers a1, a2, ... an = (a1 + a2 + ... + an)/n

Calculation: Let the average weight of 14 members be x

⇒ (14x + 72)/15 = x + 1.4

⇒ 14x + 72 = 15x + 21

⇒ 51 = x

So, the average weight is 51

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