Final answer:
The theoretical probability of the spinner not stopping on red is 2/3.
Step-by-step explanation:
The theoretical probability of the spinner not stopping on red can be calculated by finding the probability of the spinner stopping on white or black, and subtracting it from 1. The spinner has a total of 3 red spaces, 5 white spaces, and 1 black space. So, the probability of the spinner stopping on red is 3/9. Therefore, the probability of the spinner not stopping on red is 1 - 3/9 = 6/9 or 2/3.