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Brian,
We actually do that at the beginning of the year to convey the uncertainty in a student's measure of length, mass, and volume (from a graduated cylinder). Each student measures a standard objects length, mass, liquid's volume. Find the average, find the range of reasonable values (this is where I am likely liable by not using st dev). The value from the average to the largest reasonable value is our uncertainty.
I tell them there are other ways to do it. This is how we will acknowledge uncertainty exists.
Have a good one.
Paul Lulai (where I've managed to live through a pillory or 2, gotten a bit thicker skin (or a longer neck), and actually have 5 physics majors in college right now (grad h.s. class of ~150) ;)