A complete cycle of a traffic light takes 60 s. During each cycle the light is green for 25 s, yellow for 5 s and red for 30 s. At a randomly chosen time, the probability that the light will not be green is?

1/3
1/4
5/12
7/12

Correct Answer: 7/12

Explanation:

Time taken for complete cycle = 60 s
Probability that light will be green = (Time for which light is green)/(time taken for complete cycle)
= 25/60 = 5/12
∴ Probability that light will not be green = 1- 5/12 = 7/12

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