The probability of winning the cup prize is equal to 1/5 and in percentage it is 20%.
Probability is always defined as the ratio of the number of the favorable outcomes to the total number of the outcomes in other words the probability is a number that shows the happening of any event.
Probability = Number of favorable outcomes / Number of total sample
Since there are five cups overall and only one of the cups has a one 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 in percentage it is 20%.
To know more about probability, visit:
https://brainly.com/question/30034780
#SPJ4