How to sign: approximating the statistical norm or average or expected value
"the average income in New England is below that of the nation"; "of average height for his age"; "the mean annual rainfall";
Similiar / Same: mean
How to sign: around the middle of a scale of evaluation of physical measures
"an orange of average size"; "intermediate capacity"; "a plane with intermediate range"; "medium bombers";
Similiar / Same: medium, intermediate