The mean of five numbers is 27. If one number is excluded, their mean is 25. Find the excluded number.
The mean of the numbers is 27
The sum of 5 numbers = 5 * 27
= 135
If one number is excluded, then the new mean is 25
Therefore sum of new numbers = 4 * 25
= 100
Therefore, excluded number = 135 – 100
= 35