Two Plus Two Older Archives

Two Plus Two Older Archives (http://archives2.twoplustwo.com/index.php)
-   Probability (http://archives2.twoplustwo.com/forumdisplay.php?f=23)
-   -   Winning 1 coinflip out of 16? (http://archives2.twoplustwo.com/showthread.php?t=307043)

samr 08-03-2005 05:35 PM

Winning 1 coinflip out of 16?
 
Took 16 coinflips today (pair v overs or overs v pair) and won one of them. What is the odds of that?

Is this an application of the Bernoulli theorem?

win pct: w = 0.5
lose pct l = 0.5
(w + l)^16, find 16 c 15 w^1 * l^15

= 16 * .5^1 * .5^15 = 2^4 * 2^-16 = 2^-12 = 1 in 4096.

kyro 08-03-2005 05:59 PM

Re: Winning 1 coinflip out of 16?
 
Winning exactly 1 coinflip is 1/4096. Winning 1 or less is 1/4096 + 1/65536 = 17/65536. So yeah, tough luck.

jba 08-03-2005 06:03 PM

Re: Winning 1 coinflip out of 16?
 
I would say it's the same as losing 16

or winning 16

or losing the first eight and losing the last eight

all of these are the same; of all the possible ways flipping a coin 16 times could result, there is only one that fits our description. in this case the answer is:

P=.5^16


EXCEPT: that in your problem there are 16 ways to do it (win the first, lose the next 15; lose the first, win the second, lose the rest, etc). You don't care which one you won.

P=.5^16*16=0.000244140625

1/4096

hey that's what you said


I guess I should go google this bernoulli punk..


All times are GMT -4. The time now is 12:38 AM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.