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

In 2011, the arithmetic mean of the annual incomes of Ramesh and Suresh was Rs. 3800. The arithmetic mean of the annual …

There were 24 students in a class. One of them, who was 18 years old, left the class and his place was filled up by a ne…

The average of 30 numbers is 40 and that of other 40 numbers is 30. The average of all the numbers 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 age of all the students of a class is 18 years. The average age of boys of the class is 20 years and that of…

The average age of mother and her six children is 12 years, which is reduced by 5 years if the age of mother is excluded…

A team of 8 persons joins in a shooting competition. The best marksman scored 85 points. If had scored 92 points, the av…