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.
Many women feel as though they are in a perpetually bloated state, but there is no rounding of the belly to show for it! How soon you begin to âshowâ is as varied and individual as women are. During the third or fourth month of pregnancy seems to be the time most women begin to show their pregnancies. Although you may not quite be ready for maternity clothes, you will be ready to move into drawstring or elastic-band pants. Some women donât really begin to show until well into their fifth month.