Graph Analysis

eddy2017

eddy2017

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Oct 27, 2017
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Hi, dear friends and teachers: I am struggling to solve this graph. I have attached it as a pdf here.
I thank you for any clue or hint. they have given me the correct answer choice, and i need to figure out why that is the correct answer.

All I can see is that the from both schools 10 students take home 4 books
they asked a 300 students from each school.
I have also seen that the amount of students in each school is different.
1,500 at Grand High
2,250 at Roosevelt school.
I am stuck here. Don't seem to figure out what to do next.

eddy
 

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Last edited:
What do you think of the five choices?

What is YOUR OPINION concerning the choices?

How would YOU describe for the school board the results of the survey?

What would you post on social media to describe the results?
 
tkhunny said:
What do you think of the five choices?

What is YOUR OPINION concerning the choices?

How would YOU describe for the school board the results of the survey?

What would you post on social media to describe the results?
Click to expand...
They gave the answer choice. it is C. But I am asked to reason it out, find why.
Choice a is out of the question, because it says the amount of books taken is equal in both schools. That can not be a true statement because I am given that one school has more students than the other, and 300 students from each were surveyed.
B and E is also wrong because it doesn't make sense.
So, it is either C or D. But I don't know how to explain why it is C.
 
eddy2017 said:
They gave the answer choice. it is C. But I am asked to reason it out, find why.
Choice a is out of the question, because it says the amount of books taken is equal in both schools. That can not be a true statement because I am given that one school has more students than the other, and 300 students from each were surveyed.
B and E is also wrong because it doesn't make sense.
So, it is either C or D. But I don't know how to explain why it is C.
Click to expand...
Let's simplify a bit.
A school has 1000 students. You surveyed 100 students. 5 of them take home 4 textbooks. What's the expected total number of students who take home 4 textbooks?
 
lev888 said:
Let's simplify a bit.
A school has 1000 students. You surveyed 100 students. 5 of them take home 4 textbooks. What's the expected total number of students who take home 4 textbooks?
Click to expand...
My apologies. I had to get off the computer for a good while.
The expected number would 20. i would have to multiply 5*4. Not sure, just thinking of something here.
 
eddy2017 said:
My apologies. I had to get off the computer for a good while.
The expected number would 20. i would have to multiply 5*4. Not sure, just thinking of something here.
Click to expand...
Could you explain your reasoning?
 
Lev888, I really can't. I am sorry. I think that was wrong. I have never been exposed to this kind of interpretation. I would need a hint.
Maybe this is a good reasoning. Let's see
I have to compare 100 surveyed to the total of students so I divide 1000/10=10
so i would multiply 10*5=50 is the expected number to take home 4 books
5 because out of the sample of 100, 5 took books home. Does it make sense?.
 
Last edited:
Yes, you are correct that 1000 students will take out 50 books.

Image putting the 1000 students into groups of 100. There will then be 10 groups. In each group 5 will take home 4 textbooks. As you said, there will be 5*10 = 50 students taking out 4 books.
 
eddy2017 said:
Lev888, I really can't. I am sorry. I think that was wrong. I have never been exposed to this kind of interpretation. I would need a hint.
Maybe this is a good reasoning. Let's see
I have to compare 100 surveyed to the total of students so I divide 1000/100=10
so i would multiply 10*5=50 is the expected number to take home 4 books
5 because out of the sample of 100, 5 took books home. Does it make sense?.
Click to expand...
 
So, according to lev88's hint, and Jomo's confirmation I will solve it in like manner.

300 compared to 15,000 (because 300 from each school were surveyed against total population of students)

15,000/3 =5
Now, we have to multiply 10 * 5 ( 10 number of textbooks) for grant H.S=50


Now, comparing the 300 surveyed to the Rooselvet's student population.
2,250/300=7.5

10 *7.5 =75

so we get this relationship of multiplying by 5 and 7.5 for Roosevelt School.

10 *5=50 grant high

10*7.5=75 Rooselvelt high

And that is why it is C 75-50=25

Awaiting confirmation.
Thanks.
 
Actually after looking at the pdf the two numbers you divided were both wrong? Slow down and look at the problem to see what the numbers are instead of trying to remember the numbers.
 
how about now?.
And, why are both wrong?
2,350/300 =7.5
So, the only thing I can think of right now is to multiply 5*10(number of textbooks taken home)=50
and 7.5*10=75, that is, 25 textbooks more than Grant High.
 
Last edited:
eddy2017 said:
how about now?.
And, why are both wrong?
2,350/300 =7.5
Click to expand...
I said the two numbers you divided are both wrong. I did not say that both divisions were wrong.

You were to divide two numbers, namely 1500 and 300. For the 1500 you put the wrong number (you put 15,000) and for the 300 you put the wrong number (you put 3). That is why I said both numbers (Not both divisions) were wrong.
 
Jomo said:
I said the two numbers you divided are both wrong. I did not say that both divisions were wrong.

You were to divide two numbers, namely 1500 and 300. For the 1500 you put the wrong number (you put 15,000) and for the 300 you put the wrong number (you put 3). That is why I said both numbers (Not both divisions) were wrong.
Click to expand...
Oh, yes, sorry. Thanks a lot.
 
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