Out of 32 numbers, the average of the first 16 numbers is 54, and the average of the last 15 numbers is 57. If the 17th number is excluded, what will be the average of the remaining numbers (correct to one decimal place)?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 55.5.
Exclude the 17th number, so remaining = 31 numbers
Sum of first 16 = 16 × 54 = 864
Sum of last 15 = 15 × 57 = 855
Total sum (excluding 17th number) = 864 + 855 = 1719
Average = = 55.5