Understanding mean, median, mode and range is essential to be able to compare sets of data. Watch the video to hear Steph, a sports coach, talk about why collecting and comparing data is useful ...

Standard deviation is a statistical measurement that looks at how far a group of numbers is from the mean. Put simply, standard deviation measures how far apart numbers are in a data set.

Standard deviation is a statistic measuring the dispersion of a dataset relative to its mean. It is calculated as the square root of the variance. Learn how it's used.