<p>If you calculate the way depicted in the eHow:</p>
<p>(18-13)/13 * 100 = 38.46%
38.46 / 22 = 1.748%</p>
<p>The average percent change per year is 1.748% per year. However, the answer needs to be in pounds per person per year.</p>
<p>Well, both sides have equally valid points.</p>
<p>But think about this: It was THE LAST PROBLEM on section 2. Could they possibly give us such an easy problem which just wants us to find the slope? I mean lets be realistic.</p>
<p>It wasn’t a grid in, for the record. But it’s still very tantalizing.</p>
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<p>My dad’s point is that “pounds per person per year” isn’t the unit; he says that “average rate of change” is in percent. I got tricked by this too (and also by that absence of percentage signs in the answer choices). This is the ambiguity that I want to point out to CB and at least have them give reasoning.</p>
<p>It’s either 1/4 or 1/2 and we won’t know the right answer until Dec 21st. :(</p>
<p>Oh yeah sorry i forgot it wasnt a grid-in, but it was still the last problem</p>
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<p>It can’t be 1/2. delta y/delta x is 5/22. The answer, IMO, is either 1/4 or 2 (unfortunately, more likely 2 than 1/4; 1/4 just seemed too easy).</p>
<p>It’s really not worth it to get all worked up over a question. You’re not going to be able to lead a crusade against CB and have them not count the question. If they think the question is worded ‘vaguely’, then they’ll decide what to do. </p>
<p>And honestly, I’m leaning on the side of you ‘rewording’ the question to fit your argument. Furthermore, just because your parents have Phd’s doesn’t mean they’re the final say. Heck, they didn’t even see the question.</p>
<p>@Pi, the answer could have been 1/2 if it was the summation of all the |slopes|. (abs value)</p>
<p>I am now 99% sure the answer is 1/4.
If you have dealt with calculus or physics you will understand my reasoning.</p>
<p>How do you get average change in velocity in a displacement vs. time graph?
You simply draw a straight line in between the first point and the last point.</p>
<p>Vavg = /\d over / </p>
<p>The answer is indeed 1/4. Sorry, somestudent2 and samrath30.</p>
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<p>My hope is that the answer is 1/4 and that I misremembered the question. The only reason I’m citing my parents’ credentials is so that it doesn’t look like I’m talking out of my ass on CC (I mean, who believes a boy who cries wolf :)). This question really seems like economics and finding the slope on the last question of a section just seemed way too easy.</p>
<p>EDIT: <a href=“http://www.math.vt.edu/people/mcquain/arc_25.pdf[/url]”>http://www.math.vt.edu/people/mcquain/arc_25.pdf</a> Scroll down to find sections on “average rate of change” and “percent rate of change.” I’m hoping my dad is just confusing “average rate” with “percent rate”</p>
<p>Agree w/ Avid 99.99%.</p>
<p>If the question was asking average rate of change, then I’m sure it was 1/4. </p>
<p>I don’t even really remember seeing rate – though I’ll trust CC to remember, haha.</p>
<p>I guess the twist was that you were supposed to realize that delta x was 22, not 11.</p>
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<p>I actually did that and ended up with 3.55 (and divided by 22, it came out to .14). But when I think about it, I don’t think I used absolute value. The only reason I buy my dad’s argument is because 1/4 seemed too easy. Of the 5 choices, 1/4 was my choice, 1/2 was a trick answer for the people who counted squares and not years, and 5 was a trick for the people who only calculated delta y. For a last question, I was really suspicious of 2 out-of-the-blue answers.</p>
<p><a href=“http://www.math.vt.edu/people/mcquain/arc_25.pdf[/url]”>http://www.math.vt.edu/people/mcquain/arc_25.pdf</a> Scroll down to find sections on “average rate of change” and “percent rate of change.” I’m hoping my dad is just confusing “average rate” with “percent rate.” My dad also mentioned that “average change” is different from “average rate of change,” if that helps anyone. We need a math teacher…or Silverturtle. :)</p>
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<p>That only explains 1/2 as a trick answer. Where do 2 and 2.5 come from?</p>
<p>I got 1/4 for the potato/tomato question too…</p>
<p>and I can’t believe I got the 40/7 one wrong. I want to go die in a hole now…</p>
<p>@somestudent2,</p>
<p>I just realized “average rate of change in pounds per person per year” wasn’t what the question said. My reasoning behind this is “average” and “per year” are redundant. The question more likely asked, “rate of change in pounds per person per year”.</p>
<p>Here we go again… :D</p>
<p>^<a href=“http://talk.collegeconfidential.com/1066004517-post895.html[/url]”>http://talk.collegeconfidential.com/1066004517-post895.html</a></p>
<p>I don’t think that person is wrong…at least, maybe he/she’s not wrong? But IDK. Anybody else know a math/econ teacher?</p>
<p>Average indicates total divided by # of participants.
Per year indicates total divided by number of years.
It’s redundant…</p>
<p>Although I still think the answer is = 1/4.</p>
<p>I hope to God that the answer is 1/4 and I’m not even religious. My dad’s argument along with the fact that this was the last question in the section leads me to doubt myself quite a bit.</p>
<p>I’m curious of the implications if the question merely asked “average change” rather than rate of change. Would that not result in a different answer?</p>
<p>Note: I’m not trying to make up a scenario that favors mine, but that may be how I read the question (and what I believed it to be); whether it said rate or not, I have no clue.</p>