Formulae for the standard deviation. Whilst it is not necessary to learn the formula for calculating the standard deviation, there may be times when you wish to include it in a report or dissertation. The standard deviation of an entire population is known as Ï (sigma) and is calculated using:
After 8-20 hours, the egg hatches and the fly enters the maggot stage. It begins to feed on whatever the egg was laid on, usually decomposing flesh. The maggot gorges itself with food until it is ready to enter the pupal stage, at which point the maggot travels away from the food source to a moist spot.
Maggots are the larvae of the adult blow fly. If produce, meat or even fecal matter is left out in the open, the adult flies seize the opportunity to lay their eggs in this warm, moist and nutritious material. Within several days, the eggs hatch into maggots, and several days later, the maggots mature into adult flies.