Most bow manufacturers’ advertising gives IBO speeds as part of their sales spiel. Most of those specifications cover a range (typically 8 fps) or make claims “up to X fps”.
Given the IBO specifically states draw length, arrow weight and draw weight, what does this range of numbers represent?
Is this standard deviation, extreme deviation or some other range I am unfamiliar with?
If this is "standard deviation", is this measurement taken from one bow or an average of the bows taken from the production line.