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Question:

Math probability about traffic lights?

A traffic light is red for 25 sec, yellow for 5 sec, and green for 55 sec. what is the probability that when you reach the light, the light is green? this light is not red?

Answer:

Hi there. To figure out this problem the first thing you need to know is the total time for the traffic light cycle, so add up all the times. 85 seconds is the total time cycle. If you would like to know the probability for the green light, take the amount of time for the green light over the amount of time for the total cycle. So 55/85 is the fraction. You get to simplify for the final answer. If you would like to know the probability for the light not being red, you have to add up the times when the light is not red. So the time for yellow plus the time for green would be 60 seconds. And again set up a fraction for the time not red over the total cycle time. 60/85, and you get to simplify for the final answer. Hope this helps. :)
If you drive really slow, you probably won't catch the green light. If you drive fast, you probably will catch the green light.
the complete light cycle is 55 + 5 + 25 = 85 seconds. light is green for 55/85 = 65% of the time light is not red for (55+5)/85 = 71% of the time 65% chance it will be green 71% chance it won't be red

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