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The mean is the average value and the standard deviation is the variation from the mean value.
Residual point
For a population the mean and the expected value are just two names for the same thing. For a sample the mean is the same as the average and no expected value exists.
mean: average
An asset depreciates in value when the amount of money for which the asset can be sold decreases over time. A well known recent example is residences in Los Angeles, Las Vegas, south Florida, and most of Great Britain.