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Question
Solve any two of the following.
Find the mean of the data given in the following table.
| Class | 0-20 | 20-40 | 40-60 | 60-80 | 80-100 |
| Frequency | 6 | 4 | 5 | 7 | 3 |
Solution
| Class |
Class Mark` (x_1)` |
Frequency `f_1` |
`x_1f_1` |
| 0-20 | 10 | 6 | 60 |
| 20-40 | 30 | 4 | 120 |
| 40-60 | 50 | 5 | 250 |
| 60-80 | 70 | 7 | 490 |
| 80-100 | 90 | 3 | 270 |
| 25 | 1190 |
Mean=`(∑x_1f_1)/(∑f_1)`
=`1190/25`
=`47.6`
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