Question

if the average weight of 8 children is 25.6kg and average weight of 7 children is 26.2kg then what is the average weight of 15 children​

Answer 1

Answer:

25.88 kg

Explanation:

Let, Total sum of the weight of 8 children be 'X'.

Average=Sum of observations÷ Number of observations

$\frac{x}{8} = 25.6 \\ x = 25.6 \times 8 \\ x = 204.8$

Let , total sum of the weight of 7 children be 'y'.

$\frac{y}{7} = 26.2 \\ y = 26.2 \times 7 \\ y = 183.4$

Total sum of Weights of the children =x + y

=204.8+183.4

=388.2

Average Weight of 15 children=

$\frac{388.2}{15} = 25.88 \: kg$