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[1] Mathematical expectation - Encyclopedia of Mathematics
http://www.encyclopediaofmath.or ... matical_expectation
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Mathematical expectation is used in probability. Mean value is used in statistics. The weight of the expectation is probability but mean value uses frequency or percentage as weight. They are different in theory and are not exchangeable.

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In probability and statistics, mean and expected value are used synonymously to refer to one measure of the central tendency either of a probability distribution or of the random variable characterized by that distribution. --Wikipedia
The expected value is also known as the expectation, mathematical expectation, EV, mean, or first moment. --Wikipedia

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In mathematics and statistics, average would be called the arithmetic mean. -- Wikipedia
¡°average¡±Ö»ÊÇarithmetic mean£¬ÓëmeanÓв»Í¬.

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Average value is the same as mean value. But what's mean error is not clear. You may append their definitions when you use them.

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