Question

Every day a school bus driver passes the same traffic light twice, once before school and once after. Each time he passes the light, he records If it is red, green, or yellow.

Here is a summary of the data he got after 200 days.

Traffic light before school Traffic light after school Number of day
red red 25
red green 21
red yellow 17
green red 16
green green 31
green yellow 27
yellow red 22
yellow green 28
yellow yellow 13

Suppose the driver will continue recording the colors for 150 more days.
In how many of these 150 days will the light be red exactly once? Use the data to make a prediction.

Answer 1

Step-by-step explanation: the amswer is B trust me

Answer 2

Number of days in which light would be red exactly once is 57.

From the table :

Number of days in which light is red exactly once

• 21 + 17 + 16 + 22 = 76

From the experiment, The probability of having red exactly once is :

P(red once) = 76 / 200 = 0.38

Using the probability value:

Number of days in which light would be red exactly once in 150 days :

• 0.38 × 150 = 57

Hence, Number of days in which light would be red exactly once is 57.