Question

Q-15
The average weight of 7 persons is diminished by 2kg when one of them who weight 66 kg is replaced by
a new man. Find the weight of the new man.
o 54 kg
46 kg
56 kg
52 kg
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Answer 1

Answer:

average = sum of all observation

number of all observation

total weight = 7a

average weight = a-3.

7a-21-7a=-21

-21=w-73. ( here w=weight

w=52

Answer 2

Answer:

The weight of new man is $54$kg.

Step-by-step explanation:

It is given that the average weight of seven persons is diminished by $2$kg when one of them who weight $66$ kg is replaced by a new man.

We need to determine the weight of new man.

Average is a number expressing the central or typical value in a set of data.

It is the ratio of sum of observations to number of observations.

If by replacing $66$kg by a new man reduces the average by $2$kg.

It means that $2$kg should be reduced from all the numbers.

Hence, $7*2=14$ need to be reduced from sum of all observations.

As only one is replaced, hence weight of new man is $66-14=52$kg.

Option (d) is correct.

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