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A student must pass through two sets of traffic lights on his way to work. The...

A student must pass through two sets of traffic lights on his way to work. The first light is red 50% of the time, yellow 5% of the time and green 45% of the time. The second light is red 20% of the time, yellow 10% of the time and green 70% of the time. Assuming that the lights operate independently, what is the probability that the student has to stop at least one time on his way to work? (He will stop only for a red light, and not if it is yellow.)

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