expected value vs mean value

expected value and mean value both are nouns.

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

As nouns, mean value is a hypernym of expected value; that is, mean value is a word with a broader meaning than expected value:

expected value: the sum of the values of a random variable divided by the number of values
mean value: an average of n numbers computed by adding some function of the numbers and dividing by some function of n

Other hypernyms of expected value include mean.

expected value (noun)	mean value (noun)
the sum of the values of a random variable divided by the number of values	an average of n numbers computed by adding some function of the numbers and dividing by some function of n