Oh, now I see. You want to know how many servings to get out of a 10 lb bag
before you buy it.
Ok, well according to
Calorie Count, Brach's candy corn (which is usually the most ubiquitous brand) has a serving size of 22 pieces and that serving weighs 40 grams.
Now, if you had a 10 lb bag, that would weigh a total of 4,535.92 grams. I think for simplicity's sake we can round that to 4,536 grams. We then divide that by 40 and get 113.4. Now typically there is always a little lost due to crumbs at the bottom, accidental spillage, etc, so I think you can realistically expect about 110 servings out of a 10 lb bag.
Which means that there are about 110 servings, about 2420 pieces, and about 11 servings per pound.