9.8 and 9.9 - Exploring Data

These sections expand on the main ideas of mean, median, and mode that we've known for a long time. But now, Variance and Standard Deviation are added. The equations for these are given in the chapter, but most of the problems involve too many numbers to do in a reasonable amount of time, so it's a good decision to just use standard deviation and variance calculators online. The following example finds the mean, median, and mode of the set 3, 7, 14, 15, 21, 21.

Mode: 21

Median: 14.5

Mean: 13.5