The standard deviation of a random variable, statistical population, data set, or probability distribution is the square root of its variance. It is algebraically simpler, though in practice less robust, than the average absolute deviation.he variance is the mean of these values: and the population standard deviation is equal to the square root of the variance: This formula is valid only if the eight values with which we began form the complete population.
Report Abuse. 1  Sounds like the sweep worked. You will typically go into labor within 24-48 hours if a membrane sweep worked. 2  For some it doesn't work at all - if its going to work usually within 24hrs you are in labor. Invisible Pink RN Â· 7 years ago.
On Cat Activation, you will get 240 washes. When it gets down to 10 washes, the Cartridge LED lights to remind you to get a new Cartridge. When three washes remain, the Cartridge lights and a beep sounds. The CatGenie 120 only operates with a SaniSolution 120 Cartridge.uilt-in sensors, called GenieEyes, know when your cat is using the CatGenie so the cleaning will not start. If programmed for Auto Set will not start until 60 seconds AFTER the cat has left. If another cat jumps in, the CatGenie waits until that cat leaves.