Typhoid – Salmonella
Pneumonia – Streptococcus
Ring worm – Sacculina
Filariasis – Wuchereria
Ring worm is caused by fungi such as Microsporum, Trichophyton, not by Sacculina, which is a parasitic crustacean.
Find the variance of the following frequency distribution:
| Class Interval | ||||
| 0--4 | 4--8 | 8--12 | 12--16 | |
| Frequency | 1 | 2 | 2 | 1 |