Question

The probability that a traffic light will be green is 40%. If you pass through 3 lights on your way to the store, what is the probability that all three will be red?

Answer 1

0.216

Explanation:

If the probability of green, P(green) is 40%, the probability of red, P(red) is 60%.

The probability of a light being red is not affected by the colour of the previous light, so at each of the 3 lights, the probability of red is always 60%.

To find the probability that all three lights will be red, multiply the three probabilities together. (Convert them to decimals first).

0.6 x 0.6 x 0.6 = 0.216