expectation vs expected value

expectation and expected value both are nouns.

Word	Noun	Adjective	Verb	Adverb
expectation	Yes	No	No	No
expected value	Yes	No	No	No

As nouns, expectation and expected value are synonyms defined as:

expectation and expected value: the sum of the values of a random variable divided by the number of values

Other synonyms of expectation include arithmetic mean, first moment.

expectation (noun)	expected value (noun)
belief about (or mental picture of) the future	the sum of the values of a random variable divided by the number of values
the sum of the values of a random variable divided by the number of values
the feeling that something is about to happen
anticipating with confidence of fulfillment