Mathematics
The mean of the following data is 16. Calculate the value of f.
| Marks | No. of students |
|---|---|
| 5 | 3 |
| 10 | 7 |
| 15 | f |
| 20 | 9 |
| 25 | 6 |
Measures of Central Tendency
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Answer
| Marks (xi) | No. of students (fi) | fixi |
|---|---|---|
| 5 | 3 | 15 |
| 10 | 7 | 70 |
| 15 | f | 15f |
| 20 | 9 | 180 |
| 25 | 6 | 150 |
| Total | Σfi = 25 + f | Σfixi = 415 + 15f |
By formula; Mean =
Substituting the values, we get
Hence, the value of f = 15.
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