The average of 9 results is 45 . If the average of the first four results is 44 and that of the last four is 47 , the fifth no. is : |
46 51 41 42 |
41 |
Average of 9 results = 45 Sum of these 9 results = 405 Sum of first four numbers = 44 × 4 = 176 Sum of last four numbers = 47 × 4 = 188 ∴ 5th number = Sum of all numbers - ( Sum of first four numbers + Sum of last four numbers ) 5th number = 405 - ( 176 + 188 ) = 41 |