Using a dot graph and a frequency chart, Marcos listed data and found the following: Mean, Median, Mode, Upper Quartile, Lower Quartile, Interquartile Range, and Standard Deviation. Finding the Standard Deviation involved taking each data point, subtracting it from the mean, squaring that difference, then adding all of those squared values up and dividing by one less than the number of data points. This results in the variance. The square root of the variance is the standard deviation.