#1
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Please check this formula
Just wondering if this formula is correct...
p = your chance of winning T = number of trials x = min. wins x --- \ / nCr(T,i) * p^i * (1-p)^(T-i) --- i=0 A) For a coin flip... what are the chances that heads comes up a min of 8 times out of 20... answer ~87% B) for pocket pairs vs. 2 overs (roughly 54% - 46%)... what are the chances of losing 100 times out of 200... I calculated this as <12% using the above formula Someone claimed to have lost 156 out of 200 of these situations <cough...bull<cencored>>... somewhere around 1 in 1.97E+20 |
#2
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Re: Please check this formula
[ QUOTE ]
Just wondering if this formula is correct... p = your chance of winning T = number of trials x = min. wins x --- \ / nCr(T,i) * p^i * (1-p)^(T-i) --- i=0 A) For a coin flip... what are the chances that heads comes up a min of 8 times out of 20... answer ~87% [/ QUOTE ] 87% is correct, but you must sum i from 8 to 20 wins, not 0 to 8. [ QUOTE ] B) for pocket pairs vs. 2 overs (roughly 54% - 46%)... what are the chances of losing 100 times out of 200... I calculated this as <12% using the above formula [/ QUOTE ] You would sum i from 0 to 100 with p = 0.54 to get the probability of winning 100 or less. I get 14.3% using the equivalent Excel function =binomdist(100,200,0.54,true). |
#3
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Re: Please check this formula
[ QUOTE ]
=binomdist(100,200,0.54,true). [/ QUOTE ] WOW... excel has this built in... I'm an idiot! [img]/images/graemlins/wink.gif[/img] |
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