The average of 6 numbers is 9, when one number is discarded the average of the remaining numbers becomes What is the discarded number?
Solution
Correct Answer: Option B
The average of 6 numbers is 9 --> the sum of 6 numbers = (mean)*(number of terms) = 9*6 = 54.
The average of 5 numbers is 7.2 --> the sum of 5 numbers = (mean)*(number of terms) = 7.2*5 = 36.
The discarded number = 54 - 36 = 18.
Practice More Questions on Our App!
Download our app for free and access thousands of MCQ questions with detailed solutions