Question

146. The mean (average) of five numbers is 100. If one number, 80 is removed fr
om the list,
what will be the mean of remaining numbers ?
(a) 110
(b) 95
(c) 105
(d) 90​

Answer 1

Answer:

(c) 105

Step-by-step explanation:

Let the sum of the numbers be 'x',

Avg of 5 numbers = x / 5

100 = x / 5

Therefore, x = 500

Now 80 is removed from the sum, so the sum becomes;

x - 80 = 500 - 80 = 420

Now,

Avg of 4 numbers = New sum / 4              (as one number is removed)

                              = 420 / 4

                              = 105