Continuing his conversation about data sets from the previous video, Sal introduces range, variance, and standard deviation as means of dispersion. Those advancing in algebra or beginning a statistics class will benefit from Sal's clear...

Video reviews the population and sample mean and variance then expands to population and sample standard deviation. Gives examples of calculating the standard deviation. [13:07]

Video first reviews sample and population mean and their notation. Gives example of how variance is a useful description of a set and shows how to calculate variance including notation. Includes link to practice problems. [12:23]