Question

The mean of 5 numbers is 20. If one is excluded, mean of the remaining numbers becomes 23. Find the excluded number.​

Answer 1

Answer:

The mean of 5 numbers is 20.

Sum of all the 5 numbers=20X5=100.

If one is excluded.

The remaining Number will be 4.

The mean of the remaining numbers becomes 23.

Sum of all the 4 numbers=23X4=92.

The excluded number=Sum of all the 5 numbers-Sum of all the 4 numbers.

=100-92

=8.