# 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

Question 6 Mean Median And Mode Of Ungrouped Data Exercise 18B

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

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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