every day a school bus driver passes the same traffic light twice, once before school and once after. each…

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.\nhere is a summary of the data he got after 50 days.\n|traffic light before school|traffic light after school|number of days|\n|----|----|----|\n|red|red|3|\n|red|green|7|\n|red|yellow|4|\n|green|red|11|\n|green|green|9|\n|green|yellow|2|\n|yellow|red|5|\n|yellow|green|2|\n|yellow|yellow|7|\nsuppose the driver will continue recording the colors for 100 more days.\nin how many of these 100 days will the light be yellow at most once? use the data to make a prediction.

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.\nhere is a summary of the data he got after 50 days.\n|traffic light before school|traffic light after school|number of days|\n|----|----|----|\n|red|red|3|\n|red|green|7|\n|red|yellow|4|\n|green|red|11|\n|green|green|9|\n|green|yellow|2|\n|yellow|red|5|\n|yellow|green|2|\n|yellow|yellow|7|\nsuppose the driver will continue recording the colors for 100 more days.\nin how many of these 100 days will the light be yellow at most once? use the data to make a prediction.

Answer

Explanation:

Step1: Calculate total number of days in data

The data is for 50 days.

Step2: Count number of days with yellow at most once

Count the rows where yellow appears 0 or 1 time: $(3 + 7+4 + 11+9 + 5+2)=41$ days.

Step3: Calculate proportion

The proportion of days with yellow at most once in 50 - day data is $\frac{41}{50}$.

Step4: Predict for 100 days

Multiply the proportion by 100: $\frac{41}{50}\times100 = 82$.

Answer:

82