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This video lecture introduces the definition of expected value and does a discrete example. Then the definition of variance is given, and properties are discussed, including the variance of a linear function of a random variable.

Video from Khan Academy. An introduction to expected value. It starts with the arithmetic mean and develops expected value for a discrete distribution. Shows that the formula for expected value is the same as the population mean.
Identifier: 
http://www.khanacademy.org/math/probability/v/expected-value--e-x
Rating: 
2.95
Average: 3 (267 votes)
Creator(s): 
Khan Academy
Cataloger: 
Lisa Green
Publisher: 
Khan Academy
Rights: 
Creative Commons

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