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#1 2013-07-29 05:13:28

anna_gg
Member
Registered: 2012-01-10
Posts: 113

Pick Random Numbers

Get two random numbers between 0 and 1. Subtract the smaller from the bigger. What is the probability that the result is <0.3? Is it greater than the probability to be > or equal to 0.3?
For what number (instead of 0.3) the probability for both cases is the same?

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#2 2013-07-29 06:14:58

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 84,445

Re: Pick Random Numbers

Hi;

Is it greater than the probability to be > or equal to 0.3?

I am not understanding you here, the P(≥.3) = .49

Did you check your post about the towns?


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

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#3 2013-08-01 04:22:58

anna_gg
Member
Registered: 2012-01-10
Posts: 113

Re: Pick Random Numbers

Correct.
So, to have equal probability for both cases, we have to substitute 0.3 with 1-sqrt(0.50) = 1-0.707 = 0.292

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#4 2013-08-01 06:13:04

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 84,445

Re: Pick Random Numbers

Hi;

Yes to get both equal to 1 / 2 we would need

Have you seen the answer given for,

http://www.mathisfunforum.com/viewtopic … 50#p279650


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Online

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