Solve the problem.
-A traffic light is red for 40 seconds, yellow for 5 seconds, and green for 60 seconds. Find the probability: P(the light is green or yellow)
A) $\frac { 2 } { 105 }$
B) $\frac { 2 } { 15 }$
C) $\frac { 13 } { 30 }$
D) $\frac { 13 } { 21 }$

Question

Quizplus · Accepted Answer

The total cycle time is 40 (red) + 5 (yellow) + 60 (green) = 105 seconds. The light is green or yellow for 5 (yellow) + 60 (green) = 65 seconds. Therefore, the probability is $ \frac { 65 } { 105 } = \frac { 13 } { 21 } $.

Solve the Problem 2105\frac { 2 } { 105 }1052​ B) 215\frac { 2 } { 15 }152​

Solve the Problem $\frac { 2 } { 105 }$ B) $\frac { 2 } { 15 }$