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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
Question 1 Mean Median And Mode Of Ungrouped Data Exercise 18B
Obtain the mean of the following distribution:
| Variable (xi) | Frequency (fi) |
|---|---|
| 4 | 4 |
| 6 | 8 |
| 8 | 14 |
| 10 | 11 |
| 12 | 3 |
Answer:
| Variable (xi) | Frequency (fi) | fi xi |
|---|---|---|
| 4 | 4 | 16 |
| 6 | 8 | 48 |
| 8 | 14 | 112 |
| 10 | 11 | 110 |
| 12 | 3 | 36 |
| - | Σ fi = 40 | Σ fi xi = 322 |
We know that
Mean = Σ fi xi/ Σ fi
By substituting the values
Mean = 322/40 = 8.05
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