Math Problems

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General Douchebag

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Re: Math Problems
« Reply #120 on: January 25, 2009, 01:26:54 AM »
Nobody else did it in their head?
No but I'm guess your what? 90? Cause you just so darn mature </sarcasm>

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Parsifal

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Re: Math Problems
« Reply #121 on: January 25, 2009, 01:51:50 AM »
Nobody else did it in their head?

Now that you mention it, I just realised there's a much easier way than writing a computer program. Oh well.
I'm going to side with the white supremacists.

Re: Math Problems
« Reply #122 on: January 25, 2009, 09:42:10 AM »
How would you do it without calculating which number has the most sums to it?  Or is that what you did?

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General Douchebag

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Re: Math Problems
« Reply #123 on: January 25, 2009, 10:05:00 AM »
I just found the average between 8 and 48
No but I'm guess your what? 90? Cause you just so darn mature </sarcasm>

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theonlydann

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Re: Math Problems
« Reply #124 on: January 25, 2009, 10:08:32 AM »
3 + 2 =


 FES SUPER MATH TEAM GO!

Re: Math Problems
« Reply #125 on: January 25, 2009, 10:17:22 AM »
is ti 23456543687645643245768.344533222334455443322345453345345
Only 2 things are infinite the universe and human stupidity, but I am not sure about the former.

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theonlydann

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Re: Math Problems
« Reply #126 on: January 25, 2009, 10:24:26 AM »
:-D

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Raist

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Re: Math Problems
« Reply #127 on: January 25, 2009, 10:28:47 AM »
500/0

Go.

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General Douchebag

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Re: Math Problems
« Reply #128 on: January 25, 2009, 10:30:08 AM »
No but I'm guess your what? 90? Cause you just so darn mature </sarcasm>

Re: Math Problems
« Reply #129 on: January 25, 2009, 11:11:01 AM »
Doesn't the answer change if you specify whether or not order matters?  That answer is when order does matter (right?), but if it didn't, isn't it a tie between multiples?  Jeeze, I have an exam on this crap tomorrow, I should figure this out.

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Parsifal

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Re: Math Problems
« Reply #130 on: January 25, 2009, 11:24:19 AM »
I just found the average between 8 and 48

Don't use ambiguous terms like "average", please. We are specifically looking here for the mean value.
« Last Edit: January 25, 2009, 12:35:49 PM by Robosteve »
I'm going to side with the white supremacists.

Re: Math Problems
« Reply #131 on: January 25, 2009, 12:26:54 PM »
Ok I can't figure out out.  How would you calculate it as if the dice weren't labeled 'Dice 1, Dice 2, Dice 3' etc.  i.e. (6, 6, 6, 6, 6, 6, 6, 5) is the same as (6, 6, 6, 6, 5, 6, 6, 6) is the same as (5, 6, 6, 6, 6, 6, 6, 6,) etc.

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Parsifal

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Re: Math Problems
« Reply #132 on: January 25, 2009, 12:35:42 PM »
Ok I can't figure out out.  How would you calculate it as if the dice weren't labeled 'Dice 1, Dice 2, Dice 3' etc.  i.e. (6, 6, 6, 6, 6, 6, 6, 5) is the same as (6, 6, 6, 6, 5, 6, 6, 6) is the same as (5, 6, 6, 6, 6, 6, 6, 6,) etc.

The mean value of 1, 2, 3, 4, 5 and 6 is 3.5. Therefore, the most likely sum of n rolls is 3.5n.
I'm going to side with the white supremacists.

Re: Math Problems
« Reply #133 on: January 25, 2009, 12:48:12 PM »
Example:  Two dice are rolled, which sum of the two added dice values has the greatest probability of being made?

First, where order does matter:

   1 2 3 4  5  6

1  2 3 4 5  6  7
2  3 4 5 6  7  8
3  4 5 6 7  8  9
4  5 6 7 8  9  10
5  6 7 8 9  10 11
6  7 8 9 10 11 12


It's 7.  [3.5(2) = 7]

Second, where order doesn't matter (I can't come up with a better way to calculate it):

2: 1,1
3: 1,2
4: 1,3 2,2
5: 1,4 2,3
6: 1,5 2,4 3,3
7: 1,6 2,5 3,4
8: 2,6 3,5 4,4
9: 3,6 4,5
10: 4,6 5,5
11: 5,6
12: 6,6

It's 6, 7, and 8.  Get my question now?

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Parsifal

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Re: Math Problems
« Reply #134 on: January 25, 2009, 12:54:35 PM »
Get my question now?

Some of the cases in the second scenario are more likely to happen than others, so you can't use the number of cases for each sum alone to determine probability.
I'm going to side with the white supremacists.

Re: Math Problems
« Reply #135 on: January 25, 2009, 01:10:40 PM »
Some of the cases in the second scenario are more likely to happen than others, so you can't use the number of cases for each sum alone to determine probability.

Ohhhhh, i c wut u tink thar.  I think I get it now.

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Euclid

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Re: Math Problems
« Reply #136 on: January 26, 2009, 12:01:45 AM »
An HIV test is 99% accurate if the patient is known to be HIV-positive.  It is 99% accurate if the patient is known to be HIV-negative.  The test is administered to a random person in a population.  Assuming the prevalence of HIV in the population is 1%, what is the chance the person will test positive?
Quote from: Roundy the Truthinessist
Yes, thanks to the tireless efforts of Euclid and a few other mathematically-inclined members, electromagnetic acceleration is fast moving into the forefront of FE research.
8)

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Parsifal

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Re: Math Problems
« Reply #137 on: January 26, 2009, 02:52:48 AM »
An HIV test is 99% accurate if the patient is known to be HIV-positive.  It is 99% accurate if the patient is known to be HIV-negative.  The test is administered to a random person in a population.  Assuming the prevalence of HIV in the population is 1%, what is the chance the person will test positive?

1.98%
I'm going to side with the white supremacists.

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Euclid

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Re: Math Problems
« Reply #138 on: January 26, 2009, 09:56:16 AM »
An HIV test is 99% accurate if the patient is known to be HIV-positive.  It is 99% accurate if the patient is known to be HIV-negative.  The test is administered to a random person in a population.  Assuming the prevalence of HIV in the population is 1%, what is the chance the person will test positive?

1.98%

Wrong.
Quote from: Roundy the Truthinessist
Yes, thanks to the tireless efforts of Euclid and a few other mathematically-inclined members, electromagnetic acceleration is fast moving into the forefront of FE research.
8)

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Robbyj

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Re: Math Problems
« Reply #139 on: January 26, 2009, 09:57:04 AM »
I haven't done the math, but I would assume that it has to be less than one.
Why justify an illegitimate attack with a legitimate response?

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Euclid

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Re: Math Problems
« Reply #140 on: January 26, 2009, 09:59:11 AM »
I haven't done the math, but I would assume that it has to be less than one.

Percent? No.
Quote from: Roundy the Truthinessist
Yes, thanks to the tireless efforts of Euclid and a few other mathematically-inclined members, electromagnetic acceleration is fast moving into the forefront of FE research.
8)

Re: Math Problems
« Reply #141 on: January 26, 2009, 10:01:42 AM »
I got 1.99, but that wasn't including the 1%, which I couldn't figure out how to include.  I think Robo's is right, as I've done it before.

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Robbyj

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Re: Math Problems
« Reply #142 on: January 26, 2009, 10:03:27 AM »
Statistics are dumb.
Why justify an illegitimate attack with a legitimate response?

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Euclid

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Re: Math Problems
« Reply #143 on: January 26, 2009, 10:03:54 AM »
I got 1.99, but that wasn't including the 1%, which I couldn't figure out how to include.  I think Robo's is right, as I've done it before.

Still not right.
Quote from: Roundy the Truthinessist
Yes, thanks to the tireless efforts of Euclid and a few other mathematically-inclined members, electromagnetic acceleration is fast moving into the forefront of FE research.
8)

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Raist

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Re: Math Problems
« Reply #144 on: January 26, 2009, 10:08:53 AM »
%2 with significant figures.

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Euclid

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Re: Math Problems
« Reply #145 on: January 26, 2009, 10:11:01 AM »
Quote from: Roundy the Truthinessist
Yes, thanks to the tireless efforts of Euclid and a few other mathematically-inclined members, electromagnetic acceleration is fast moving into the forefront of FE research.
8)

Re: Math Problems
« Reply #146 on: January 26, 2009, 10:13:31 AM »
1.02

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Euclid

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Re: Math Problems
« Reply #147 on: January 26, 2009, 10:17:07 AM »
Quote from: Roundy the Truthinessist
Yes, thanks to the tireless efforts of Euclid and a few other mathematically-inclined members, electromagnetic acceleration is fast moving into the forefront of FE research.
8)

Re: Math Problems
« Reply #148 on: January 26, 2009, 10:19:32 AM »
1.0099

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Euclid

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Re: Math Problems
« Reply #149 on: January 26, 2009, 10:20:03 AM »
Quote from: Roundy the Truthinessist
Yes, thanks to the tireless efforts of Euclid and a few other mathematically-inclined members, electromagnetic acceleration is fast moving into the forefront of FE research.
8)