Q. 325.0( 7 Votes )

The mean of five numbers is 30. If one number is excluded, their mean becomes 28. The excluded number is
A. 28

B. 30

C. 35

D. 38

Answer :

Given,


The mean of five numbers = 30


Now to calculate the sum of these five numbers we have to multiply the mean by 5,


So, we get,


Sum of five numbers = 5 × 30 = 150


Change in the mean when one number is excluded, it become = 28


Sum of remaining four numbers = 4 × 28 = 112


Now to find out the excluded number we have to subtract the sum of four numbers from the sum of five numbers,


We get,


The excluded number = sum of five numbers - sum of four numbers


= 150 – 112 = 38

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses