Question

The average age of 10 friends is 15 years when you friend johnston and then average it increases to 16 years what is the age of a new friend

Answer 1

es question ka answer 26 year

Answer 2

The age of new friend is 26 years

Step-by-step explanation:

$Mean = \frac{\text{Sum of all observations}}{\text{Number of observations}}$

The average age of 10 friends is 15 years

$15 = \frac{\text{Sum of age of 10 friends}}{10}$

$150 =\text{Sum of age of 10 friends}$

Let the age of new fiend be x

So, New sum = 150+x

We are given that the new mean is 16 years

$16 = \frac{150+x}{11}$

$16 \times 11 = 150+x$

176 = 150+x

176-150=x

26 = x

Hence The age of new friend is 26 years

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