The average of five numbers is 48. When one number is removed, the average of the remaining four numbers becomes 45. What is the value of the number that was excluded?
Show answer & explanation
Correct answer: A
Explanation
Given:
Average of 5 numbers = 48
Average of 4 numbers = 45
Formula:
Sum = Average × Number
Total sum of 5 numbers = 5 × 48 = 240
Total sum of 4 numbers = 4 × 45 = 180
Number removed = 240 − 180 = 60
Number removed = 60