Question

The mean of five numbers is 28. If one of the numbers is excluded , the mean gets reduced by 2. Find the excluded Number.

Answer 1

Hii friend,

Mean of 5 numbers = 28

Sum of these 5 numbers = (28×5) = 140

Mean of remaining 4 numbers = (28-2) = 26

Sum of these remaining 4 numbers = (26×4) = 104

Therefore,

Excluded Number = (Sum of the 5 numbers)-(Sum of the 4 numbers)

= (140-104) = 36

Hence,

The excluded number is 36

HOPE IT WILL HELP YOU.... :-)

Answer 2

given mean of five numbers = 28
mean = sum of observation/no. of observation
thus sum = 28*5 = 140
let say excluded no. be X
so sum = 140-x
no . of observation = 4
new mean = 28-2 = 26
thus 26*4 = 140-x
X = 36