A complete cycle of a traffic light takes 60 seconds. During each cycle the light is green for 25 seconds, yellow for 5 seconds and red for 30 seconds. At a randomly chosen time, the probability that the light will not be green, is

Question

A complete cycle of a traffic light takes 60 seconds. During each cycle the light is green for 25 seconds, yellow for 5 seconds and red for 30 seconds. At a randomly chosen time, the probability that the light will not be green, is (A)  (1/3)  (B)  (1/4)  (C)  (4/12)  (D)  (7/12)

Tardigrade Admin · Accepted Answer

∴ Required probability =(30+5/60) =(7/12)

Q. A complete cycle of a traffic light takes $60 seco n d s$ . During each cycle the light is green for $25 seco n d s$ , yellow for $5 seco n d s$ and red for $30 seco n d s$ . At a randomly chosen time, the probability that the light will not be green, is

$\frac{1}{3}$

$\frac{1}{4}$

$\frac{4}{12}$

$\frac{7}{12}$

$\frac{3}{4}$

$∴$ Required probability
$= \frac{30 + 5}{60}$
$= \frac{7}{12}$

Q. A complete cycle of a traffic light takes 60seconds. During each cycle the light is green for 25seconds, yellow for 5seconds and red for 30seconds. At a randomly chosen time, the probability that the light will not be green, is

31​

41​

124​

127​

43​

∴ Required probability =6030+5​ =127​