So because the wheel is split into equal segments. We can assume that if Harry has a single number then there is a 1/15 chance of Harry's number being chosen. To find the percentage you need to type 1 divided by 15 into a calculator press then the percentage sign . This will give you 66.66666666666...., this number to the nearest 2 d.p is 66.67 % because 6 rounds up to seven.