The arithmetic mean of first 11 natural numbers is

The average of 30 numbers is 40 and that of other 40 numbers is 30. The average of all the numbers is :

If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55 and 60, then the average marks of…

The mean of 25 observations was found to be 78.4. But later on it was found that 96 were misread as 69. The correct mean…

The average of X<sub>1</sub>, X<sub>2</sub> and X<sub>3</sub> is 14. Twice the sum o…

The arithmetic mean of the series 1, 2, 4, 8, 16, . . . . . . , 2<sup>n</sup> is -

The average age of 10 children is 9 years 9 months. The average of 9 children is 8 years 11 months. What is the age of t…

The average weight of 21 boys was recorded as 64 kg. If the weight of the teacher was added, the average increased by 1 …