Question

The mean of 5 numbers is 18. If one number is excluded, their mean is 16. Find the excluded number.

Answer 1

Mean of 5 numbers=18

$\therefore Total=18\times 5=90$

By excluding one number, the mean of remaining 5-1=4 numbers =16

$\therefore Total=16\times 4=64$

$\therefore$ Excluded number=90-64=26