SOLUTION: a traiffic lights follows the pattern green (50 seconds), yell (5 seconds), and red (25 seconds). What is the probability that a driver approaching this light will find it green o

Question 30321: a traiffic lights follows the pattern green (50 seconds), yell (5 seconds), and red (25 seconds). What is the probability that a driver approaching this light will find it green or yellow?
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Let's see...the traffic lights are on (green, yellow, or red) for a total of 50 seconds (green) + 5 seconds (yellow) + 25 seconds (red) = 80 seconds.
So, the probability of a green light being on is:

The probability of a yellow light being on is:

The probability of a red light being on is:

The probability of A or B is:
but for mutually exclusive events such as in this situation (Only one of the lights can be on at any time), so we have:

For the traffic lights, the probability of green or yellow being on is:

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