how to calculate z score
calculating a z score requires that you first determine the mean and standard deviation of your data once you have these figures you can calculate your z score so assume you have the following variables you would use the variables in the formula so your selected value has a z score that indicates it is 1 25 standard deviations from the mean to determine z score using a spreadsheet you ll need to input your values and determine the average for the range and the stadard deviation using the formulas you ll find that the following values have a mean of 12 17 and a standard deviation of 6 4 using the z score formula you can figure out each factor s z score use the following formula in d2 then d3 and so on 