representation. n. 1. the act or an instance of representing or the state of being represented. 2. anything that represents, such as a verbal or pictorial portrait. 3. anything that is represented, such as an image brought clearly to mind.
The standard deviation and range are both measures of the spread of a data set. Each number tells us in its own way how spaced out the data are, as they are both a measure of variation. The range relies on a very simple formula of subtracting the minimum data value from the maximum.
Calculate the Population Standard Deviation. 1  Calculate the mean or average of each data set. 2  Subtract the deviance of each piece of data by subtracting the mean from each number. 3  Square each of the deviations.  Add up all of the squared 1  deviations. Divide this value by the number of items in the data  set.