The average of 15 numbers is 55. Four numbers 25, 12, 15 and 36 were removed. What will be the new average?
Show answer & explanation
Correct answer: C
Explanation
Given:
Number of values = 15, Average = 55
Removed values = 25, 12, 15, 36
According to the formula:
Sum = Average × Number of values
Original Sum = 15 × 55 = 825
Sum of removed values = 25 + 12 + 15 + 36 = 88
New Sum = 825 − 88 = 737
New number of values = 15 − 4 = 11
New Average = 737 / 11 = 67