The average weight of 44 members of a club is 68.5 kg. If 6 members of average weight 72.8 kg leave and 2 new members of average weight 56.1 kg join the club, then the average weight (in kg) of the present members of the club is (correct to nearest integer):
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Correct answer: A
Explanation
The correct answer is option 1 i.e. 67.
Initial total weight = 44 × 68.5 = 3014 kg
Weight of 6 leaving members = 6 × 72.8 = 436.8 kg
Weight of 2 new members = 2 × 56.1 = 112.2 kg
New total weight = 3014 − 436.8 + 112.2 = 2689.4 kg
New number of members = 44 − 6 + 2 = 40
New average = = 67.235 = 67 kg