Despite the above ^^^^, I still maintain that it's a broad spectrum, and some folk get on with swapping over for certain things, others less so. Obviously, a sample of one as 'proof of concept' is not enough in itself, but I am right-handed for most things (writing, cutting vegetables etc...) and played drums from the outset right-handed. After a couple of years, and not feeling the progress I was wanting, I swapped the kit over (bass pedal on the left foot, hi-hat to my right...) and have never looked back. I peel potatoes 'righty', but, as the peeler has a two-edged blade, I often peel 'lefty', just so as to use the other half of the blade. In my model-making, I often have to use my scissors in the left hand, or use power tools held in the left hand. I agree that to force anyone, especially young children, to do things 'righty' is an abomination (our grand-son is a hard 'lefty'...), but would always encourage anyone to at least try stuff the other way round (yes, righty trying things out with their left hand, too...). I've no idea as to the statistical spread, but I would guess that, most folk fall into the 'bell curve', and that their are many that are ambidextrous, at least to some degree. Those at either end of this bell curve are, I would guess, more of a minority than the basic '10%' are left-handed'. That's all I'm suggesting.