JayDelV
  • JayDelV
Andrew believes the honor roll students at his school have an unfair advantage in being assigned to the math class they request. He asked 500 students at his school the following questions: "Are you on the honor roll?" and "Did you get the math class you requested?" The results are shown in the table below:
Mathematics
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SOLVED
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katieb
  • katieb
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JayDelV
  • JayDelV
Honor roll Not on honor roll Total Received math class requested 215 125 340 Did not get math class requested 80 80 160 Total 295 205 500
JayDelV
  • JayDelV
Help Andrew determine if all students at his school have an equal opportunity to get the math class they requested. Show your work and explain your process for determining the fairness of the class assignment process.
anonymous
  • anonymous
OK. Similar process to last question. There are two events: A - making the honor roll, and B - getting the requested math class. From the info in the table, can you calculate P(A)?

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More answers

JayDelV
  • JayDelV
80?
anonymous
  • anonymous
Not quite. There are 295 (215 + 80) on the honor roll and 500 students total. So the probability is 295/500. What do you get?
anonymous
  • anonymous
Hello?
JayDelV
  • JayDelV
0.59
anonymous
  • anonymous
Good.
anonymous
  • anonymous
Now, of the 295 that makethe honor roll, 215 of them get the math class they want. What's P(B)?
JayDelV
  • JayDelV
0.41
anonymous
  • anonymous
No. The probability is 215/295 as explained above. What do you get?
JayDelV
  • JayDelV
Oh okay i made a mistake. 0.72
anonymous
  • anonymous
Watch your rounding. I get 0.7288 which doesn't round to 0.72. What should it be?
JayDelV
  • JayDelV
I wasn't sure if i should round, 0.73
anonymous
  • anonymous
I think the rounding is OK. If we need extra decimal places, we'll find out later in the problem.
anonymous
  • anonymous
OK. So you've determined that if a student makes the honor roll, they have about a 73% chance of getting the math class they want.
anonymous
  • anonymous
Now, look at the students that don't make the honor roll. There's 205 of them and 125 get the math class they want. What's the probability?
JayDelV
  • JayDelV
0.61
anonymous
  • anonymous
Great. So the students who don't make the honor roll have a 61% chance of getting the math class they want. Should be able to answer the question: Do all students have an equal chance of getting the math class they want. If not, which group has a better chance?
anonymous
  • anonymous
Turns out our very first calculation wasn't needed to answer the question so it can be ignored.
JayDelV
  • JayDelV
They do not , and students who do not make honor roll?
anonymous
  • anonymous
I agree with the first part. Recall, students who make the honor roll have a 73% chance of getting the class they want while 61% of the students who don't make the honor roll get the class they want. Which group has a better chance?
anonymous
  • anonymous
Hello?
JayDelV
  • JayDelV
Oh i forgot about that, so students who make honor roll have the advantage
anonymous
  • anonymous
Right. Good job.
JayDelV
  • JayDelV
Thank you very much :)
anonymous
  • anonymous
You're welcome

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