Match the following:
| Zoological Name | Common Name | ||
|---|---|---|---|
| A) Pila | I) Apple snail | ||
| B) Lepisma | II) Silver fish | ||
| C) Daphnia | III) Water flea | ||
| D) Aranea | IV) Spider |
Find the variance of the following frequency distribution:
| Class Interval | ||||
| 0--4 | 4--8 | 8--12 | 12--16 | |
| Frequency | 1 | 2 | 2 | 1 |