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 Experimental probability Experimental probability of an event is the ratio of the number of times the event occurs to the total number of trials. Peter rolled a number cube 50 times. A 3 appeared 10 times. Then the experimental probability of rolling a 3 is $\frac{10}{50}$ or 20%. When a coin was tossed 150 times, a tail resulted in 52 of the tosses. Find the experimental probability of tossing tails for this experiment? The experimental probability of tossing tails is $\frac{52}{150}$.