Question

In a small scale industry, salaries of employees are given in the following distribution table:

Salary (in Rs.)	4000 - 5000	5000 - 6000	6000 - 7000	7000 - 8000	8000 - 9000	9000 - 10000
Number of employees	20	60	100	50	80	90

Then the mean salary of the employee is?

विकल्प

• Rs. 7350

• Rs. 7400

• Rs. 7450

• Rs. 7500

Answer 1

Rs. 7450

Explanation:-

Class interval	Frequency (fi)	Midpoint (xi)	fixi
4000 - 5000	20	4500	90000
5000 - 6000	60	5500	330000
6000 - 7000	100	6500	650000
7000 - 8000	50	7500	375000
8000 - 9000	80	8500	680000
9000 - 10000	90	9500	855000
	`sumf_i=400`		`sumx_if_i=2980000`

Therefore mean is

`barx=(sumx_if_i)/(sumf_i)`

`barx=2980000/400`

`barx=7450`