The average of 11 results is 60. If the average of the first six results is 58 and that of the last six is 63, find the 6th result.
Note
The average of 11 results = 60
The total of 11 results = (60 × 11) = 660
The average of the first six results = 58
Average of last six results = 63
Total of first six results = (58 × 6) = 348
Total of last six results = (63 × 6) = 378
∴ Sixth results = total of first and last six results = total of 11 results
= (348 + 378) - 660
= (726 - 660)
= 66.