Question

In a factory, there are workers belonging to four categories. The average income and the number of workers in each category are given. What is the mean income when all the workers in the four categories are combined?

Class	No. of workers	Average income (Rs)
I	12	6000
II	16	8000
III	8	9500
IV	4	11000

Answer 1

Mean income = \(\frac{320000}{40}\)

= Rs. 8000