The average of 8 numbers is 45. If each of the first 4 numbers is increased by 5 and each of the last 4 numbers is decreased by 3, what will be the new average?
Show answer & explanation
Correct answer: C
Explanation
Number of numbers = 8
Average = 45
Initial Sum = 45 × 8 = 360
Increase in the first 4 numbers = 4 × 5 = +20
Decrease in the last 4 numbers = 4 × 3 = −12
New Sum = 360 + 20 − 12 = 368
New Average = 368 / 8 = 46