SOLUTION: Carson drives to school the same way each day, and there are two independent traffic lights on his trip to school. He knows that there is a 30% chance that he will have to stop at

Algebra ->  Probability-and-statistics -> SOLUTION: Carson drives to school the same way each day, and there are two independent traffic lights on his trip to school. He knows that there is a 30% chance that he will have to stop at       Log On


   

Question 1005147: Carson drives to school the same way each day, and there are two independent traffic lights on his trip to school. He knows that there is a 30% chance that he will have to stop at the first light and an 80% chance that he will have to stop at the second light. What is the probability that he will NOT have to stop at either light? (2 points)


14% is the answer but I don't know why
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
A 30% chance that he will, means 70% that he won't.
An 80% chance that he will, means 20% that he won't.
Now multiply 20% by 70% and you get 14%.