Mathematics
Using the information given in the adjoining histogram, calculate the mean correct to one decimal place.
Measures of Central Tendency
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Answer
We construct the following table :
| Class interval | Class mark (yi) | Frequency (fi) | fiyi |
|---|---|---|---|
| 20 - 30 | 25 | 3 | 75 |
| 30 - 40 | 35 | 5 | 175 |
| 40 - 50 | 45 | 12 | 540 |
| 50 - 60 | 55 | 9 | 495 |
| 60 - 70 | 65 | 4 | 260 |
| Total | 33 | 1545 |
∴ Mean = = 46.8
Hence, mean of the following distribution is 46.8
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