Question

The mean of numbers is 27. If one number is excluded their mean is 25. Find the excluded observation.​

Answer 1

Find the sum of 5 numbers:

Mean of 5 numbers = 27

Sum of 5 numbers = 27 x 5 = 135

Find the sum of the 4 numbers:

Mean of the 4 numbers = 25

Sum of the 4 numbers = 4 x 25 = 100

Find the excluded observation:

135 - 100 = 35

Answer: 35