Question
There are two branches of an examination employing 100 and 80 person respectively. If the arithmetic mean of the monthly salaries by two branches are Rs. 275 and Rs. 225 respectively. Find out the arithmetic mean of the salaries of the employees of the establishment as a whole.
Solution
Combined Mean
= (275 X 100) + (225 X 80)
100 + 80
= 27500 + 18000 = 45500
180 1800
= Rs. 252.8.
