+109 A traffic light runs repeatedly through the following cycle: green for 40 seconds, then yellow for 5 seconds, then red for 35 seconds, which repeats indefinitely. Oliver picks a random time and watches the light for 75 seconds. What is the probability that I see green?
+37191 It is green for 40 out of (40+5+35) seconds = 40 out of 80 seconds
the probability that you see green watching it for 75 seconds means
you will see green in that 75 seconds EVERYTIME or 100 % ....there is no 75 seconds where it is not going to have at least a portion of a green phase.
