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#1 2007-10-23 03:47:50

mikau
Member
Registered: 2005-08-22
Posts: 1,504

quick probability question

suppose you flip a coin, if its heads, i have to guess a number between 1 and 6 and roll a die to see if i'm right. If its tails, i have to guess a number between 1 and 12 and role a 12 sided die.

What are the odds that i will guess correct?


A logarithm is just a misspelled algorithm.

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#2 2007-10-23 06:40:57

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

Re: quick probability question

1/2*1/6 + 1/2*1/12 = 1/8.


Why did the vector cross the road?
It wanted to be normal.

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#3 2007-10-23 06:51:08

pi man
Member
Registered: 2006-07-06
Posts: 251

Re: quick probability question

Nevermind.

Last edited by pi man (2007-10-23 06:51:42)

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#4 2007-10-23 15:29:09

mikau
Member
Registered: 2005-08-22
Posts: 1,504

Re: quick probability question

ah ha!

so, if you had to roll a 1 in 3 choice that led you to a 1/2, 1/3, 1/4 guess respectively, the probabability would be

1/3(1/2 + 1/3 + 1/4) Correct?


A logarithm is just a misspelled algorithm.

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#5 2007-10-24 00:56:26

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

Re: quick probability question

Yeppers!


Why did the vector cross the road?
It wanted to be normal.

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