In this video, Salman Khan of Khan Academy explains standard deviation.
Khan Academy

In this video, Salman Khan of Khan Academy explains sample variance.
Khan Academy

In this video, Salman Khan of Khan Academy explains variance of a population.
Khan Academy

Interest compounded yearly, monthly, daily, etc.
About.com: Mathematics

In this Early Edge video lesson, you'll learn more about TwoStep Equations, so you can be successful when you take on highschool Math & Algebra.
The Princeton Review

Amy received grades of 85, 87, 88, and 92 on her math tests. What must her grade be on her next test if her average is sto be at least 90?
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In this video, Salman Khan of Khan Academy explains binomial distribution. Part 2 of 4.
Khan Academy

In this video, Salman Khan of Khan Academy explains binomial distribution. Part 1 of 4.
Khan Academy

In this video, Salman Khan of Khan Academy explains alternate variance formulas.
Khan Academy
