I need help figuring out how to calculate "the coefficient of variation" using a ti 84 calculator.

Please explain clearly, step by step how to do it (please don't skip steps).

Here's the question:

The accompanying table contains the overall download and upload speeds in mops for nine carriers in a particular country. Click the icon to view the data. For the download speed and the upload speed separately: a. Compute the mean and median. b. Compute the variance, standard deviation, range, and coefficient of variation. c. Based on the mean and median, are the data skewed? If so, how? d. Based on the results of (a) through (c), what conclusions can you reach concerning the download and upload speed of various carriers?Data table Carrier Download Speed Upload Speed Carrier 1 21.8 14.0 Carrier 2 23.8 14.0 Carrier 3 21.1 8.9 Carrier 4 17.1 10.2 Carrier 5 10.1 6.5 Carrier 6 11.2 6.4 Carrier 7 9.6 6.5 Carrier 8 6.8 2.7 Carrier 9 4.5 3.7The coefficient of variation for the download speeds is 50.60 %. (Type an integer or decimal rounded to two decimal places as needed.) The coefficient of variation for the upload speeds is 50.00%. (Type an integer or decimal rounded to two decimal places as needed.)