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Every day a school bus driver passes the same traffic light twice, once before school and once after. Each time he passes the li
ght, 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.
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.
1 answer:
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Answer:
The value is
Step-by-step explanation:
From the question we are told that
The total number of students is
The number of student that took exam in class is n = 24
The number that took make up exam is k = 1
The average score of the first 24 students is
The standard deviation is
The average score of the student who took make up test is
Generally the new average is mathematically represented as