Question

the average age of 8 boys is 12 years if a boy of 19 years leave what is the average age of remaining boys

Answer 1

Total age of 8boys = 8*12 = 96
After 19yr old boy left, total age = 96-19= 77
Now, no of boys = 8-1=7
Avg age = 77/7 = 11years

Answer 2

The new mean is 11.

Step-by-step explanation:

Formula for mean

$Mean=\dfrac{\text{Sum of observations}}{\text{Number of observation}}$

It is given that average age of 8 boys is 12 years.

$12=\dfrac{\text{Sum of ages of 8 boys}}{8}$

Multiply both sides by 8.

$12\times 8=\dfrac{\text{Sum of ages of 8 boys}}{8\times 8}$

$96=Sum of ages of 8 boys$

A boy of 19 years leave.

Remaining boys = 8-1 = 7

Sum of ages of 7 boys = 96-19 = 77

The new mean is

$Mean=\dfrac{77}{7}$

$Mean=11$

Therefore, the new mean is 11.

#Learn more

Mean of 7 numbers is 42 if one number is excluded there mean becomes 39 what is the number Express.

https://brainly.in/question/2400893

The mean of given data is

12,3,18,17,4,19,9,20,15,13

brainly.in/question/5478117