Question

The mean of five numbers is 40. If one number is excluded, their mean becomes 25.
Identify the excluded number.​

Answer 1

Answer:

okay

let the numbers be x1 x2 x3 x4 and x5

given

(x1+x2+x3+x4+x5)/5=40

now x1+x2+x3+x4+x5=200--------(i)

consider x5 is removed

====> (x1+x2+x3+x4)/4=25=====>x1+x2+x3+x4=100------(ii)

(i)-(ii)====> x5=100 which is your required answer