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_____________?
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_____________?A. 11.0 B. 11.3 C. 11.4 D. 11.5 Sum of 11 numbers = 11×10.9 = 119.9 Sum of 1st 6 numbers = 6×10.5 = 63 So, sum of last…