The average of 8 numbers is 21. If one number 9 is excluded, find the new average.
- A. 18.48
- B. 21.54
- C. 27.85
- D. 22.71 ✓
Correct answer
D. 22.71
Explanation
Total of 8 numbers = 168. New total = 168 - 9 = 159. New average = 159/7 = 22.71.
D. 22.71
Total of 8 numbers = 168. New total = 168 - 9 = 159. New average = 159/7 = 22.71.