average size

I've been working on a writing project about glaziers in the U.S. - a subject I didn't know much about before now. In fact, before a couple weeks ago, I probably wouldn't have known that glaziers work with glass at all.

Last night, working on the intro to a section, I wanted the image of a hypothetical glazier working on the side of a building, and I realized I didn't know what the average size of an office window is, or even if there is an average size for an office window. Good old Google: on impulse, I clicked over to Google and popped in the first three words of my question - but before I could get to the windows, a drop-down box told me what Google thinks the average person wants to know the average size of...