The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.4 the sixth number is_____________?
Q1. The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.4 the sixth number is_____________?
Answer: 11.5
Explanation: Sum of 11 numbers = 119.9. First 6 sum = 63; last 6 sum = 68.4. Sixth number = 63 + 68.4 − 119.9 = 11.5.