The average of 17 results is 62. The average of the first eighth is 48 and that of the last eighth is 84, the ninth result is:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e -2.
Total of 17 results = 17 × 62 = 1054
Sum of first 8 = 8 × 48 = 384
Sum of last 8 = 8 × 84 = 672
Combined sum of first and last 8 = 384 + 672 = 1056
Since total is 1054, the 9th result = 1054 - 1056 = -2