Calculate the Population Standard Deviation. 1  Calculate the mean or average of each data set. 2  Add up all the numbers in a data set and divide by the total number of pieces of data. 3  For example, if you have found numbers in a data set, divide the sum by 4.4  This is the mean of the data set.alculate the Population Standard Deviation. 1  Calculate the mean or average of each data set. 2  Add up all the numbers in a data set and divide by the total number of pieces of data. 3  For example, if you have found numbers in a data set, divide the sum by 4.
It takes about three days to four days for your milk to come in, if youâre a first-time mum. If you've had a baby before, it can happen earlier than this. Your breasts will start to feel full a couple of days after giving birth, which is a sign that your milk is coming in.
Per Breastfeeding and Human Lactation (Riordan, 2004, p. 80), Small amounts of milk or serous fluid are commonly expressed for weeks, months, or years from women who have previously been pregnant or lactating. The amount is most often very small, however, and spontaneous flow (leaking) generally stops within 2-3 weeks. Mothers who have breastfed for a longer duration may be able to express milk for a longer time after weaning.