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.
Some women start to show very early in their pregnancies. If you have been pregnant before, your uterus and abdominal muscles may be more relaxed. Your pregnant belly may seem to âpop outâ right away. At eight weeks your uterus is about the size of a tennis ball.It is normally the size of a lemon.ome women do not start to show until they are well into their second trimester or even the start of their third trimester. If you are overweight at the start of your pregnancy, you may not gain as much weight during your pregnancy and may not begin to show until later into your pregnancy. Average: