The probability of winning the cup is equal to 1/5 and 20%.
<h3>What is probability?</h3>
Probability is defined as the ratio of the number of favorable outcomes to the total number of outcomes in other words the probability is the number that shows the happening of the event.
Probability = Number of favorable outcomes / Number of sample
Since there are five cups overall and only one of the cups has a marble, she has a 1/5 or 20 percent chance of winning the prize.
The probability will be calculated as,
P = 1 / 5
P = 0.2
P = 20%
Therefore, the probability of winning the cup is equal to 1/5 and 20%.
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