Give 5 interns 5 balls each, and a black sharpie. Have them count the dimples on each ball by putting a dot in the ones they have counted. If there were more th

Give 5 interns 5 balls each, and a black sharpie. Have them count the dimples on each ball by putting a dot in the ones they have counted. If there were more than 500 per ball I would be shocked - the group could be done in under an hour. Not sure how many you'd have to do to get a legally-valid "representative sample", but I imagine as a supportive factor to other methods of determination, it's not the worst option. It also has the advantage of being dead-simple to explain.