The average of n numbers is 55. If 70% of the numbers are decreased by 3 each and the remaining numbers are increased by 5 each, then what is the average of the resulting numbers?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 54.4.
Average = 55
Decrease = 70% × (–3) = –2.1
Increase = 30% × 5 = 1.5
Net change = –2.1 + 1.5 = –0.6
New avg = 55 – 0.6 = 54.4