Mathematics
The following table shows a record of the weights, in kilogram, of 100 pupil. Find the mean weight.
| Weight | Number of pupils |
|---|---|
| 50-53 | 15 |
| 53-56 | 18 |
| 56-59 | 20 |
| 59-62 | 25 |
| 62-65 | 16 |
| 65-68 | 6 |
Statistics
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Answer
Class mark =
| Weight | Number of pupils (f) | Class mark (x) | fx |
|---|---|---|---|
| 50-53 | 15 | 51.5 | 772.50 |
| 53-56 | 18 | 54.5 | 981 |
| 56-59 | 20 | 57.5 | 1150 |
| 59-62 | 25 | 60.5 | 1512.50 |
| 62-65 | 16 | 63.5 | 1016 |
| 65-68 | 6 | 66.5 | 399 |
| Total | Σf = 100 | Σfx = 5831 |
By formula,
Mean = = 58.31 kg.
Hence, the mean weight = 58.31 kg
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