The experimental probability of not spinning a 1 is? The answer as a fraction is 2/5 which is 40% as a percentage. 17/50, which is 34%. 1. Add together all the numbers. They add up to 50. 2. Add together the times 1 and 3 were spun. This adds up to 17. 3. Divide 17 by 50 to get the probability. 4. 17/50 equals .34, or 34%.