not necessarily. the user should be able to type in mean 33 15 24 and get 24 as a result.
the formula for arithmetic mean would be (a1+a2+a3+...+an) / n where n is number of elements.

multiple numbers in parentheses should be treated as one e.g. average 3 (24/12 + 5) 25 (3^2) yields the same result, 11, as average 3 7 25 9 (both have 4 elements)

i suggest we use the term 'mean' on the goodies page, and include 'average' an alternate keyword during a search. i also suggest we implement 'median' and 'mode'.

averages

Does it all work the way you would expect in WolframAlpha?