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xV
I post too much
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 Posted: Thu Sep 17, 2009 7:02 pm Post subject: Math People, statistic niggas |
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"At a large university, 1500 students took a final exam in chemistry."
Questions:
A. Frank learns that his scored of 76 (out of 100) places him at the 88th percentile. How many students scored lower than Frank? How many scored higher?
Answer: 88% of the class scored equal, or lower than Frank. 12% of the class scored higher.
B. Mary scored 82, which placed her at the 95th percentile. Describe how Mary's performance compares with that of others in the class.
Answer: 5% of the class scored higher than Mary's score.
C. The highest scored on the exam was 91. What percentile rank is associated with this score?
Answer: 100%, because it's the highest scored.
D. Every student who scored above the 90th percentile received an A. How many students earned this grade?
So far, I know this:
88% of the class did not receive an A (Frank's score)
Mary, having 82 as a score, is at the 95th percentile. So I know at least 5% of the class received an A.
That still leaves me with the unknown 7% (rest of the class), any ideas?
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Aids
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| Posted: Thu Sep 17, 2009 7:04 pm Post subject: |
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| tl;dr |
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Jefre.
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| Posted: Thu Sep 17, 2009 7:05 pm Post subject: |
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| [SSCA]Nevergreen wrote: | | tl;dr |
math
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xV
I post too much
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| Posted: Thu Sep 17, 2009 7:10 pm Post subject: |
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Fuck it.
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Jefre.
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| Posted: Thu Sep 17, 2009 7:11 pm Post subject: |
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JUST SAY 1000.
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Slugsnack
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| Posted: Thu Sep 17, 2009 7:12 pm Post subject: |
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| not enough info given. that, or the questions are badly posed |
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Thanh
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| Posted: Thu Sep 17, 2009 7:16 pm Post subject: |
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| This question has many various answers in the eye of the beholder. |
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xV
I post too much
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| Posted: Thu Sep 17, 2009 7:16 pm Post subject: |
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| Slugsnack wrote: | | not enough info given. that, or the questions are badly posed |
Maybe. My teacher doesn't check for accuracy, only completion to see if we attempted to try it. Then he'll ask us if we have any questions and he'll work through it. So I'll just ask him tomorrow. Too tired.
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Slugsnack
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| Posted: Thu Sep 17, 2009 7:24 pm Post subject: |
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| if that's the case, just give last answer as 150 |
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Willy
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| Posted: Thu Sep 17, 2009 7:27 pm Post subject: |
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What the fuck. The problem is impossible.
| Quote: | | B. Mary scored 82, which placed her at the 95th percentile. |
| Quote: | | D. Every student who scored above the 90th percentile received an A. |
Mary scored at the 95th percentile, yet she didn't get an A. She only scored 82/100. |
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Slugsnack
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| Posted: Thu Sep 17, 2009 7:28 pm Post subject: |
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| maybe 80%+ is A or maybe mary gave the teacher a blowjob |
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Jefre.
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| Posted: Thu Sep 17, 2009 7:28 pm Post subject: |
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I think C is supposed to be around 97-99
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Slugsnack
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| Posted: Thu Sep 17, 2009 7:30 pm Post subject: |
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| Bitcloud13 wrote: | | I think C is supposed to be around 97-99 |
no, i'm pretty sure mary gave a blowjob |
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Willy
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| Posted: Thu Sep 17, 2009 7:31 pm Post subject: |
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| Slugsnack wrote: | | Bitcloud13 wrote: | | I think C is supposed to be around 97-99 |
no, i'm pretty sure mary gave a blowjob |
This is the only reasonable explanation. |
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xV
I post too much
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| Posted: Thu Sep 17, 2009 7:35 pm Post subject: |
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No. This isn't percents, it's percentile rank.
http://en.wikipedia.org/wiki/Percentile_rank
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Last edited by xV on Thu Sep 17, 2009 7:38 pm; edited 1 time in total |
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