This statistics video tutorial explains how to calculate the coefficient of variation and the standard deviation of a sample.
Introduction to Statistics:
https://www.youtube.com/watch?v=XZo4xyJXCak&t=1s
Mean, Median, Mode, and Range:
https://www.youtube.com/watch?v=A1mQ9kD-i9I&t=1s
Standard Deviation and Variance:
https://www.youtube.com/watch?v=Uk98hiMQgN0
Standard Deviation of Grouped Data:
https://www.youtube.com/watch?v=x6Pnf57wRAs
Quartiles, Deciles, and Percentages:
https://www.youtube.com/watch?v=40o82o3uNfk&t=1s
Interquartile Range:
https://www.youtube.com/watch?v=STSP8gTSdT8&t=1s
