The average of n numbers x₁, x₂, x₃ ……………, x_n is A. If x₁ is replaced by (x + a)x₁, x₂ is replaced by (x + a)x₂ and so on. Find the new average.

The heights (in cm) of the volley-ball players from team A and team B were recorded as :

Team A : 180, 178, 176, 181, 190, 175, 187

Team B : 174, 175, 190, 179, 178, 185, 177

Which team had the greater average height ? Find the median of team A and team B.

The data representing the number of people in municipalities in different towns is shown by the bar graph given below.

(i) What is the number of people living in municipality F ?

(ii) What is the total number of people living in municipalities A to C ?

(iii) What is the total population of all the municipalities under consideration ?

(iv) What the average (mean) of people living in municipalities B to E ?

The frequency Polygon shown depicts the monthly rainfall in the Kathmandu (Nepal).

Answer the following :

(i) Which month had the highest rainfall?

(ii) How many months had rainfall above 200 mm ?

(iii) How many months had rainfall below 100 mm ?

(iv) Calculate the Mean rainfall in the months from June to September.