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.
â¦ Many start to show at about 4 months. It also depends on your weight. If you are really overweight, you may hardly show at all until about 7 months (it is hard to tell between an overweight person and pregnant person).A thin woman might show at just 3 months. It can vary with many women. 2  Normally a woman begins to show when she is about 4 months along, but it just depends, some women I have seen don't start to show until they are 6 months along even, but a majority of women begin to show at about 3-4 months along.