The average weight of 8 persons of a family is increased by 1 kg when one of the members whose weight is 60 kg is replaced by a new person. The weight of the new person (in kg) is

61
68
62
None of the above

Correct Answer: 68

Explanation:

Here , n = 8 , Weight of replaced person = 60 kg and increase in Average = 1 kg
Using formula ,
∴ Weight of new person = Weight of replaced person + n × increase in Average
Weight of new person = 60 + 8 × 1 = 68 kg

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