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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. 
Course Topic(s): Probability | Expected Value, definition and basic properties
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.
Resource URL: http://www.khanacademy.org/math/probability/v/expected-value--e-x
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Subject classification(s):
Statistics and Probability
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Probability
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Elementary Probability
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Univariate Distributions
Creator(s): Khan Academy
Contributor(s): Khan Academy
This resource was cataloged by Lisa Green
Publisher:Khan Academy
Resource copyright: Creative Commons
This review was published on October 10, 2012
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