For more success with variance and standard deviation problems, you can checkout the book I used for reference, Schaum's Statistics Outline http://amzn.to/2yeUaDk.

Variance and Standard Deviation are all statistical ways of measuring variation. We'll take a look at how to solve practice statistics problems for sample variance, sample standard deviation, population variance and population standard deviation by hand using just your calculator. In our problem we'll take a look at ages of kids at a birthday party. I also mention how to make meaning of this data if they were points somebody scores in various basketball games. Hope that helps.

*More practice statistics and probability videos*
+ Average (Mean, Mode, Midrange):    • Mean, Mode, Median, Midrange: Statist...  
+ Variance and Standard Deviation:    • Variance and Standard Deviation: Samp...  
+ Frequency Tables:    • How to Create Frequency Tables for Da...  
+ Hypothesis Testing:    • Point Estimates and Confidence Interv...  

My goal is to help my students flourish in all aspects of their lives. Here are some recommended tools to help you find success.

*Success in Statistics and Probability*
+ Statistics Demystified http://amzn.to/2yDhH2m
+ Probability Demystified http://amzn.to/2yWm70k

*Success in School*
+ How to Win at College http://amzn.to/2yeQjGq
+ Get Better Grades by Studying Smarter! http://874bf9z88y64q27254i133i6q.hop...
+ How to be a Straight A Student http://amzn.to/2zd7vui

*Success In Life*
+ Goal Tracking System (webbased) http://d6a218199dz69xd106ogz9s470.hop...
+ Innovation & Creative Thinker (skill employers love) http://amzn.to/2zdQUq3
+ Developing a Mindset for a Fulfilled Life http://amzn.to/2xwVzqd

The videos I post on YouTube are primarily for my own college students, so I usually do not have time to respond to YouTube comments. But, I'll do my best to respond when I can.