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प्रश्न
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?
पर्याय
Rs. 7350
Rs. 7400
Rs. 7450
Rs. 7500
MCQ
उत्तर
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`
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