Answer 1

The monthly salaries in rupees of 30 workers in a factory are given below:

5000, 7000, 3000, 4000, 4000, 3000, 3000, 3000, 8000, 4000, 

4000, 9000, 3000, 5000, 5000, 4000, 4000, 3000, 5000, 5000, 

6000, 8000, 3000, 3000, 6000, 7000, 7000, 6000, 6000, 4000

 

The frequency table of the above data is as follows:

 

Salaries (Rs.) (xi)	Number of workers (fi)	fixi
3000	8	24000
4000	7	28000
5000	5	25000
6000	4	24000
7000	3	21000
8000	2	16000
9000	1	9000
	Total N= 30	Total = 147000

Mean = `147000 / 30` = 4900
So,the mean of monthly salary is Rs. 4900.