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In probability theory, the expected value (also called expectation, expectancy, expectation operator, mathematical expectation, mean, expectation value, or first moment) is a generalization of the weighted average.
Expectancy–value theory has been developed in many different fields including education, health, communications, marketing and economics. Although the model differs in its meaning and implications for each field, the general idea is that there are expectations as well as values or beliefs that affect subsequent behavior.
"Wasn't Expecting That" is a song recorded by British singer-songwriter Jamie Lawson. It was originally released on 11 March 2011 as the lead single from his third studio album Wasn't Expecting That (2011) and peaked at number 3 on the Irish Singles Chart .