The average of a set of ten numbers is 40. If a number is removed from the set, then the average of the remaining numbers becomes 38. What was the number that was removed?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is Option 4 i.e. 58.
We know that,
Average = Sum of observations/Number of observations
According to the question;
Required number = 40 × 10 - 38 × 9
⇒ 400 - 342 = 58