The average of 13 results is 68. the average of first seven is 63 and that of the last seven is 70; the seventh result is:
Q1. The average of 13 results is 68. the average of first seven is 63 and that of the last seven is 70; the seventh result is:
Answer: 47
Explanation: Total of all 13 = 884; first 7 sum = 441; last 7 sum = 490; the 7th result is counted twice, so it equals 441 + 490 − 884 = 47.