Question

Average of $9$ numbers is $14$. If one number $12$ is excluded, find the new average.

Answer 1

Average of $9$ numbers$=14$

Let sum of $9$ no.s$=x$

$\frac{x}{9}=14$

$x=14\times 9=126$

If $12$ is excluded, sum$=126-12=114$

New average$=\frac{newsum}{8}$

$=\frac{114}{8}=14.25$