The result of the spin will be red one half, or fifty percent, of the time. The other one half, or fifty percent, black will come up. In other words there is a fifty percent chance it will be red and a fifty percent chance that it will not. Hence fifty-fifty.
With an actual roulette wheel, you have less than a fifty-fifty chance of spinning red.
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There is a 2 in 5 chance that the spinner will stop in a red section.
The chance is 25%.
Assuming the red and blue spinner has an equal number of red and blue spots, the odds of spinning blue is 50%. On the other spinner, the odds of an odd number is 67%. Combined, the odds of spinning blue and an odd number is 33%. (50% times 67%)
25%
If there are four colors on a spinner, then the probability of spinning one particular color is 1 in 4, or 0.25. Also, the probability of spinning one of two particular colors is 2 in 4, or 0.5. Combining these two "unrelated" events simply requires multiplication. The probability, then, of spinning one particular color on one spin, and then spinning one of two particular colors on the next spin is (1 in 4) times (2 in 4), or 2 in 16, or 0.125.