(06/12/2011 08:27 PM)ZiNgA BuRgA Wrote:  

(06/12/2011 06:35 PM)andrewcc Wrote:  they should try and fit other subjects in as well as sex... would be great to see how they'd work the maths curriculum

"Calculate the tangent to the end part of this condom."

1. Assume a condom tip has a spherical shape (to simplify matters) with radius 5mm.  What volume of cum can it hold in it's natural size?


2. Given the likelihood of a condom tip breaking with relation to it's radius expanding beyond the natural size is...

p(break) = { 0,          r≤1
                 (r-1)^2,  1<r<2
                 1,           r≥2  }

If in one particular session of sexual intercourse you cum out 800mm^3 of cum, what minimum radius is required so that there is a 95% probability if it not breaking?


3 (challenge).  A condom is designed with a safe capacity to hold 800mm^3 of cum.  If in a study of 36 entries, it is found the average amount of cum ejaculated is 700mm^3 with a standard deviation of 200mm^3.  Assume the amount of cum ejaculated is normally distributed, with 99% confidence, can you say the condom is actually safe?

(This post was last modified: 07/12/2011 05:45 PM by Assassinator.)

I'd answer "no" to the last one.

(07/12/2011 04:37 PM)ZiNgA BuRgA Wrote:  I'd answer "no" to the last one.

D:

Oh dear, don't tell me this is the situation you're in...

But, statistically, a guess is right 50% of the time anyway.

(07/12/2011 09:20 PM)ZiNgA BuRgA Wrote:  But, statistically, a guess is right 50% of the time anyway.

Oh yeah, this question is really awesome.  Lecturer was trolling us with it at the end of he very last lecture, and some kid who's stuck in the head a little just couldn't accept it and spent like 10 minutes arguing with everyone else.


What is the probability that a uniformly randomly chosen answer to this multiple choice question is correct?
a) 25%
b) 50%
c) 25%
d) 0%

(This post was last modified: 07/12/2011 10:37 PM by Assassinator.)

B?

I choose D!

Between the two of us, on average, wee statistically chose the right answer.

- 25% is correct if you consider it's a 4 choose 1, but there is a 50% chance of getting a 25%, so it's that's wrong, leading to....
- 50% is correct if you consider the above, because there's 2 copies of 25%.  However if 50% is the correct answer then 25% is not the correct answer then that means 50% isn't the correct answer either (there's only a 25% chance of getting 50%).
- 0% is wrong if you consider it's a 4 choose 1.  But if you consider 25%, 50%, and 0% are all wrong as deduced previously, then that means there's 0% chance of getting it right so 0% is the correct answer, but if 0% is the correct answer there's 25% chance of getting it so it's wrong and should be 25%.
- Go back to the start.


In other words, the question is a troll question and everything is correct but nothing is correct.

There's one guy in class who couldn't accept it and spent like 5 minutes trying to argue about different definitions of "uniformly randomly chosen" and stuff, lol.  This is Information Theory class by the way, so entropy and coding and compression and stuff.

(This post was last modified: 09/12/2011 04:44 AM by Assassinator.)

Couldn't have guessed it as I wasn't considering the "uniformly randomly chosen" properly - as it does send it into a loop as you described.

Interesting - and I love how this thread went on a tangent.