Answer: Experimental probability is the probability based off of real results. It is always equivalent to the number of a certain color spun (in this case, black) divided by the number of trials, 20. The experimental probability is 1/20. The theoretical probability is more like the technical probability of landing on a color. In this case, theoretical probability would be 2/10, or simplified, 1/5. If the spinner is fair, then as the number of spins increases, the probabilities will become closer.