# math

A traffic light follows the pattern green, yellow, red for 55, 5, and 20 seconds, respectively. What is the probability that the driver approaching this light will find it green or yellow?

1. 👍 0
2. 👎 0
3. 👁 167
1. Total = 55 + 5 + 20 = 80

P( green) + P( yellow) - P(green and yellow)

( 55 + 5)/80 -0

P = 60/80 = .75

1. 👍 0
2. 👎 0
posted by Chol

## Similar Questions

1. ### algebra

A TRAFFIC LIGHT IS RED FOR 38 SECONDS YELLOW FOR 10 SECONDS AND GREEN FOR ONE MINUTE AND TWELVE SEONDS. IN A CONSTANTLY REPEATING CYCLE, WHAT IS THE PROBABILITY THAT AT THE MOMENT A PASSING PEDESTRIAN GLANCES AT IT, THE LIGHT WILL

asked by ART on June 2, 2010
2. ### check/bio!!!!

okay the question is as follows: Three plants are placed in 3 different terrariums in 3 different light conditions. Plant A is placed in blue light, plant B in green light, and plant C in yellow light. In which case will there be

asked by Anonymous on June 30, 2006

I am really stuck on how to figure this answer out, could you please help me? A stoplight flashes red for 50seconds, yellow for five seconds, and green for 65 seconds. In a 24 hour period, how long is the light red?

asked by phoebe on December 3, 2010
4. ### phys

A motorist is driving at 20m/s{\rm m/s} when she sees that a traffic light 200m{\rm m} ahead has just turned red. She knows that this light stays red for 15s{\rm s} , and she wants to reach the light just as it turns green again.

asked by Av on September 16, 2014
5. ### Physics

A car is going 20m/s when they see a traffic light 200m ahead turn red. The traffic light is known to stay red for 15s. The driver wants to reach the light as it turns green. It takes them 1s to press the breaks and the car slows

asked by Confused on October 7, 2008
6. ### Math

I have my answers but need them checked and i probably got them wrong so if you can please explain. #1: Which of the following sample spaces correctly lists all the possible outcomes for flipping a coin and spinning a four-colored

asked by Leilynn22 on May 23, 2016
7. ### 7th grade math (probability)

I'm posting corrections from yesterday in addition to new ones. Still not sure how to answer #4. 2. Edwin rolls a number cube and then spins a color from a color card (red, yellow, blue, green, white). What is the probability that

asked by Alexis on May 6, 2015
8. ### 7th grade math (probability)

I'm re-posting corrections originally from Wednesday in addition to new ones. Still not sure how to answer #4. 2. Edwin rolls a number cube and then spins a color from a color card (red, yellow, blue, green, white). What is the

asked by Alexis on May 8, 2015
9. ### Math

From a sample set of 10 colored balls--5 green, 3 red and 2 yellow-- 5 are chosen at random WITH replacement. What is the probability that the result will be: green, red, yellow, red, green? Write your answer as a four place

asked by Jazz on March 13, 2016
10. ### physics

A motorist is driving at 20m/s{\rm m/s} when she sees that a traffic light 200m{\rm m} ahead has just turned red. She knows that this light stays red for 15s{\rm s} , and she wants to reach the light just as it turns green again.

asked by ehiuof on September 17, 2014

More Similar Questions