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Expectation

Compute expected value of a function of a random variable.

Over a data list it is the empirical (sample) mean of the expression with the variable replaced by each data point.

$ wo 'Expectation[x, x \[Distributed] {1, 2, 3}]'
2

$ wo 'Expectation[x^2, x \[Distributed] {1, 2, 3, 4}]'
15/2