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RS Aggarwal Solutions Class 9 Mathematics Solutions for Mean Median And Mode Of Ungrouped Data Exercise 18B in Chapter 18 - Mean Median And Mode Of Ungrouped Data
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Find the mean of daily wages of 40 workers in a factory as per data given below:
| Daily wages (in ₹ ) (xi) | Number of workers (fi) |
|---|---|
| 250 | 8 |
| 300 | 11 |
| 350 | 6 |
| 400 | 10 |
| 450 | 5 |
Answer:
| Daily wages (in ₹ ) (xi) | Number of workers (fi) | fi xi |
|---|---|---|
| 250 | 8 | 2000 |
| 300 | 11 | 3300 |
| 350 | 6 | 2100 |
| 400 | 10 | 4000 |
| 450 | 5 | 2250 |
| - | Σ fi = 40 | Σ fi xi = 13650 |
We know that
Mean of daily wages of 40 workers in a factory = Σ fi xi/ Σ fi
By substituting the values
Mean of daily wages of 40 workers in a factory = 13650/40 = ₹ 341.25
Therefore, the mean of daily wages of 40 workers in a factory is ₹ 341.25.
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