# TogoPogo

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May 2013
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1. ## What should I write? GDC

It's always good to show that you use your GDC when solving questions; our teacher told us that if we're showing the zeroes to a function or showing that a function is increasing/decreasing on a certain domain, then we should roughly sketch a small graph for proof. She didn't tell us to state "GDC" but I don't think it would hurt. As for the binomial distribution, our teacher said that P(X<=2)=binomcdf(n,p,2)= blahblah is enough for working and that it's not necessary to list out all the discrete values for X (as you have).
2. ## Physics SL TZ1 - Paper 1 and Paper 2

Basically the intensity question was concerning two identical sound waves interfering constructively at a common point O on a wall, with amplitude A. It asked you to show that the intensity of at point O was 4A^2. I think it was only hard if you didn't realize that intensity was proportional to the inverse of amplitude squared, otherwise I think P2 in general wasn't that bad.
3. ## How do you finish the math papers in time?

Oh god, thanks for the good laugh right before my P1.

31-32 points is very low for McGill, Toronto, and York (I'm not sure about the other 2 universities). Assuming that you're planning on going to McGill Desautels, Rotman Commerce at Toronto, and Schulich at York, they all seek IB grades in the mid-30's (anywhere from 33-37 I would suppose, depending on how strong your community involvement is.) To be a bit more specific - McGill requires 35 to be considered competitive (I think they said this somewhere in their admissions brochure). Toronto is a bit more vague but I would assume it's also mid-30s. York requires 38 (including bonus points) to
5. ## What would be a good, TOK-ish definition for "disagreement"?

Would this definition suffice? I tried to make it as concise as possible: "the lack of a consensus between various parties surrounding a particular topic" Thanks.
6. ## Help with percent error calculation

Whoops, I made a slight mistake. The experimental value should be -7 but the theoretical value remains at -160. The percent error should thus be 96% right?
7. ## Help with percent error calculation

I just conducted a lab on determining the molar enthalpy of a certain salt. The value that I found experimentally was 7 kJ/mol, whereas the theoretical value was -160 kJ/mol (I know, extremely off) What would the percent error be? I've never dealt with negative values when it came to these calculations. Would it just be |-167|/-160=-104% error? Is a negative percent error possible? Thanks
8. ## Having trouble installing Math HL questionbank V2 (tech problem)

I know that I'm running 64bit W7 and that it's a compatibility issue. What I'm confused about is why all of my other QB's work perfectly fine, but not this one. The SL QB found in the exact same folder as the HL QB installs perfectly.
9. ## Having trouble installing Math HL questionbank V2 (tech problem)

Hello, I can't seem to be able to install the questionbank for Math HL, version 2 (the one with exam questions from 02 to 08 i think). It seems to be a compatibility issue; every time I open it I receive this message: http://i.imgur.com/XX2Icyj.png I've tried running it under different compatibility modes (like XP service pack 2 and others) but it's not working either. The funny thing is, the Math HL questionbank setup file was in the same folder as the Math SL questionbank setup file. The SL installation for its questionbank works perfectly fine with no problems. It's just the HL one that d
10. ## Need 3D graphing software (something like gnuplot)

It's alright - thanks for the suggestions; I just stuck with gnuplot and it's good enough for my purposes.
11. ## Need 3D graphing software (something like gnuplot)

Hello, I am in search of a 3D graphing program which allows plotting of special functions like series. I have tried using gnuplot and it works perfectly fine, but I can't find out how to trace a certain x-y coordinate. Like I want to be able to input an x-y coordinate and have it respond by telling me the z coordinate on the function's surface. Any suggestions?
12. ## Textbook for Series and Differential Equations?

Hi, I was wondering if anybody knew of good textbooks that covered series and differential equations (or newly known as the calculus optional topic) in North America. I'm looking for a lightweight softcover textbook that only covers this topic (and not the entire HL math course) I saw that K.A. Tsokos has one written (the same author who wrote the cambridge IB physics companion guide) but I couldn't find any available ones on amazon. Thanks!
13. ## Poisson distribution proof help

Sorry, but how do I incorporate part a into the induction? Induction was never really my thing haha. I understand the process of induction but I don't see how part a comes into play...
14. ## Poisson distribution proof help

Ah the hint helped a lot! We didn't learn that in class :\$ Any hints for b? Is Ur supposed to be a random variable in the sense that P(X=Ur)? Thanks!
15. ## Poisson distribution proof help

Sorry, here's the URL: http://i.imgur.com/RLcFL.png Part B requires induction so I'm not sure what to do for A
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