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.
Stripping membranes, sometimes called membrane sweeping, is a method used to try to start labor. The health care provider puts her or his finger into the cervix -- the mouth of the uterus -- and uses the finger to gently separate the bag of water from the side of the uterus near the cervix.embrane stripping is done to try to start labor. Your health care provider may suggest stripping your membranes if continuing the pregnancy seems dangerous for your health or your infant's health.