Question

10) The mean of five numbers is 20. If
one number is included their mean
becomes 18. The included number is
(WRITE ONLY THE VALUE,​

Answer 1

Answer:

Let the excluded number be x.

Sum of 5 numbers =20×5=100

After excluding x.

Sum of 4 numbers =4×23=92

Therefore, x=100−92

⇒x=8