Question

8. Three groups of 10 kids. The average weight of a kid in each
group is 35 kilograms. One more kid joined each group.
i) The average weight of a kid in the first group is still 35
kilograms
The average weight of a kid in the second group is now
36 kilograms
The average weight of a kid in the third group is now
34 kilograms
Compute the weight of the new kid in each group​

Answer 1

Answer:

46 kg

Step-by-step explanation:

The average weight of a kid in a group of 10 is 35 kilograms.

Mean =\frac{\text{Sum of weights of 10 kids}}{\text{No. of kids}}

35=\frac{\text{Sum of weights of 10 kids}}{10}

35 \times 10= \text{Sum of weights of 10 kids}

350=\text{Sum of weights of 10 kids}

Now we are given that Sonu also joined them,the average became 36 kg.

So, No. of students = 10+1 =11

So, 36=\frac{\text{Sum of weights of 11 kids}}{11}

36 \times 11=\frac\text{Sum of weights of 11 kids}

396=\frac\text{Sum of weights of 11 kids}

Sonu's Weight = Sum of weights of 11 kids -Sum of weights of 10 kids

Sonu's Weight = 396-350

Sonu's Weight = 46

Hence the weight of Sonu is 46 kilo metre

Step-by-step explanation: