Mathematics
The ages of 40 students are given in the following table :
| Age (in years) | Frequency |
|---|---|
| 12 | 2 |
| 13 | 4 |
| 14 | 6 |
| 15 | 9 |
| 16 | 8 |
| 17 | 7 |
| 18 | 4 |
Find the arithmetic mean.
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The following table gives the heights of plants in centimeter. If the mean height of plants is 60.95 cm; find the value of 'f'.
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