Both terms occur frequently in all kinds of literature. "Mathematical Expectation" is perhaps the more official math term, but "Expected Value", "Expectation Value" all occur frequently. Not really sure what the best way to handle this is. Perhaps wiki supports something like aliases? [[User:Qwestor|Qwestor]] 10:02, 19 January 2009 (EST)
: I get around 750,000 google hits on ("expected value" AND probability) with 140,000 google hits on ("expectation value" AND probability). Clearly expectation value is used much more often than I had anticipated but expected value does seem more popular. [[User:AndyJM|AndyJM]] 10:16, 19 January 2009 (EST)