The average of 17 numbers is 48. The average of first 9 numbers is 45 and…
2020
The average of 17 numbers is 48. The average of first 9 numbers is 45 and average of next 9 numbers is 52. If 9th number is excluded, then the 60% of the average of the remaining
- A.
28.4625
- B.
24.4375
- C.
29.5225
- D.
28.5135
Attempted by 11 students.
Show answer & explanation
Correct answer: A
Total of 17 numbers = 17 x 48 = 816.
Total of the first 9 numbers = 9 x 45 = 405 and total of the next 9 numbers = 9 x 52 = 468.
The 9th number is counted in both groups, so it is 405 + 468 - 816 = 57.
Excluding it, the remaining average = (816 - 57)/16 = 47.4375. Required 60% = 28.4625.