Calculate the Sample Standard Deviation. 1  Calculate the mean or average of each data set. 2  To do this, 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.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.
Most pregnant women begin to show during the second trimester. You likely gained less than 5 pounds during your first trimester, but now the number on the scale is edging relentlessly upward. As your second trimester proceeds, you'll gain an average of 1 to 2 pounds per week.
On average, pregnant women begin showing during the second trimester, around 12 to 16 weeks. Normally, your uterus is the size of a lemon. By weeks 14 to 17 of your pregnancy, itâs about the size of a small melon and has risen above the pelvic cavity, making it visible above your waistline. At this point, youâll probably need to shop for maternity clothes if you havenât done so already. Early in pregnancy, some women have a âcome-and-goâ belly. Your belly may feel expanded one day and the next day, after youâve had a bowel movement, it disappears. This full belly-flat belly phenomenon, while a little unsettling, is normal.