Find the mean to determine A's average number of points scored per game.

Find the mean of the first five whole numbers.

Find the mean of first n natural numbers .

100 surnames were randomly picked up from a local telephone directory and the frequency distribution of the number of letters in the English alphabets in the surnames was obtained as follows: Determine the median number of letters in the surnames. Find the mean number of letters in the surnames? Also, find the model size of the surnames.

Find the number of triangles whose angular points are at the angular points of a given polygon of n sides, but none of whose sides are the sides of the polygon.

The given distribution shows the number of runs scored by some top batsmen of the world in one-day international cricket matches. Find the mode of the distribution.

Form the pair of linear equations in the following problems and find their solutions (if they exist) by any algebraic method : A part of monthly hostel charges is fixed and the remaining depends on the number of days one has taken food in the mess. When a student A takes food for 20 days she has to pay Rs. 1,000 as hostel charges whereas a student B, who takes food for 26 days, pays Rs. 1,180 hostel charges. Find the fixed charges and the cost of food per day.

Number of families in a village in correspondence with the number of children are given below: Find the mean number of children per family.

The family pays Rs 1000 for electricity on an average in those months in which it does not use a water heater. In the months in whih it uses a water heater, the average electricity bill is Rs 1240. The cost of using the water heater is Rs 8.00 per hour. Find the average number of hours the water heater is used in a day.