A spinner with 4 colors is spun for a total of 50 trials. Yellow was selected 10 times. What is the experimental probability of the spinner landing on yellow?

Experimental probability is the number of times an outcome occurred divided by the total number of trials. Yellow occurred 10 times in 50 trials, so the probability is 10/50 = 1/5. Therefore, the correct choice is 1 fifth.

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