Stuck on standard deviation?? This video will help you understand what that crazy formula really says.. Watch a few times if necessary... "THE AVERAGE DISTANCE TO THE MEAN!!" *sort of... How to think of this measure of spread...

Worked solutions and examples for 2013 higher level statistics and probability questions. Check out KeysToMaths1 for more tutorials and solutions: https://www.youtube.com/channel/UCOYoe9L9R13HGUIhszjkeug

Worked solution to 2014 higher level statistics question. Check out KeysToMaths1 for more tutorials and worked solutions: https://www.youtube.com/channel/UCOYoe9L9R13HGUIhszjkeug

The 95% Margin of Error for an unknown population proportion p. Check out KeysToMaths1 for more tutorials: https://www.youtube.com/channel/UCOYoe9L9R13HGUIhszjkeug

Tutorial on how to interpret data using a Stem & Leaf diagram. More free lessons at: http://www.khanacademy.org/video?v=eF6zYNzlZKQ Note: All Khan Academy content is available for free at (www.khanacademy.org)

Find out the difference between left skewed and right skewed histograms. Sometimes it is called positively and negatively skewed histograms. You will also find the symmetric histogram in this video.