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प्रश्न
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
From the above data find the mean of monthly salary.
उत्तर
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 = `(∑ f_ix_i)/(∑ f_i)`
Mean = `147000 / 30`
= 4900
So, the mean of monthly salary is Rs. 4900.
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Is it the correct answer and why?
