Sure. Luke is average height for a human.
But short for a Stormtrooper. He's probably also short for a Star Wars mini.
The 'average' for human figures in a Star Wars range is probably going to be slightly above the average of all humans in the Star Wars universe, because there are more figures like Han and the Clone-troopers, Stormtroopers, etc that are above the average height of the whole population than there are small humans produced. The wookiepedia entry doesn't say the 'average height of humans that figures are produced for'. So assuming that the average of the human figures (33mm) matches the average of the entire human population (1.7m) will probably produce Jawas that are again 'too tall' (on average), because the comparison is slightly off, and 33mm really represents something more like 1.8m. Not a large difference, but my mental maths suggests around 1-2mm which on a mini 31-35mm high would make an appreciable visual difference I reckon.