431.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.11.0B.11.3C.11.4D.11.5
432.The average of 11 results is 50, if the average of first six results is 49 and that of the last six is 52. Find the sixth result?A.46B.56C.34D.57
433.The average of 13 numbers is 60. Average of the first 7 of them is 57 and that of the last 7 is 61. Find the 8th number?A.46B.32C.68D.51
434.The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?A.0B.1C.10D.19
435.The average of 35 numbers is 25. If each number is multiplied by 5, find the new average?A.125B.134C.170D.98
436.The average of 9 observations was 9, that of the 1st of 5 being 10 and that of the last 5 being 8. What was the 5th observation?A.9B.8C.7D.6