We are going to calculate the standard deviation for the following set of sample data. 5,2,8,9,15 1) First, calculate the mean. x = 7.8 2) Fill in the table below. Fill in the differences of each data value from the mean, then the squared differences. 3) Calculate the standard deviation. x x x ( x x ) 2 5 2 8 9 15 Total Standard deviation: s = ( x x ) 2 n 1 = Round to two decimal places