Health Article Forum-Discussion about health care and Health article in Health Article Forum

having trouble with probability. ? - Health Article Forum-Discussion about health care and Health article in Health Article Forum

Welcome, Guest. Please login or register.
August 01, 2010, 01:36:42 PM
Home Help Search Login Register
News: Blog Articles: Canadian Pharmacy Services|Herbal vaporizer
More health article resources: Breast Augmentation|Northampton Dentist|Invisible orthodontics

Alternative Herbal Remedy


+ Health Article Forum-Discussion about health care and Health article in Health Article Forum
|-+ Drugs and Medication
| |-+ Vitamins
| | |-+ having trouble with probability. ?		 « previous next »
Pages: [1] Print
Author Topic: having trouble with probability. ?  (Read 257 times)
carlosm
Guest
« on: October 23, 2008, 05:24:19 PM »
6 drugs are placed along with 9 vitamins that are identical in appearance. if the police were to pick 3 of the tablets at random, what is the probability that the guy will be arrested for illegal possession of drugs? what formula should be used here?
Logged
JunAgruda
Guest
« Reply #1 on: October 23, 2008, 07:32:03 PM »
= 100%(1 - [9/15 * 8/15 * 7/15])= 100%(3,375/3,375 - 504/3,375)= 100%(375/375 - 56/375)= 100%(319/375)= 1,276/15% or 85 1/15%Answer: 319/375 or 85 1/15% or 319:56 ratio
Logged
JieZ
Guest
« Reply #2 on: October 23, 2008, 09:39:47 PM »
first find the total combinations, which is nCr(15,3)second find the combinations with one drug in it, which is nCr(6,1)*nCr(9,2)find the combinations with two drug nCr(6,2)*nCr(9,1)third find the combinations with three drugs nCr(6,3)the probability P = Na/Nall = combinations with at least one drugs in it / totoal combination = 371/455 = 0.8154
Logged
technotron
Guest
« Reply #3 on: October 23, 2008, 11:47:31 PM »
awryt.....not gonna take u thru any formula..oly plain logic~!now u hav 15 tabs6 fer succes......9 failure...u need atleast 1 in the 3 to b successful.....dat is all cases except wen all 3 are failures1 - p(f,f,f) nowp(f,f,f) = (9/15)*(8/14)*(7/13)coz u r pickin 3 tabs....nd checkin 1 by 1....reqd answer = 1 - (9! * 12!) / (15! *6! )    
Logged
stompromp
Guest
« Reply #4 on: October 24, 2008, 01:55:15 AM »
Jie Z is correct in my opinion.The formula being used is called hyper geometric distribution.http://en.wikipedia.org/wiki/Hypergeometric_distributionIf getting drugs is the defective, the formula is1 - [Pr(x=0) = [nCr(6,0) * nCr(9,3)] / [nCr(15,3)] ] = 0.815
Logged
Pages: [1] Print 
« previous next »
Jump to:  


Login with username, password and session length

Health Article Forum-Discussion about health care and Health article in Health Article Forum - having trouble with probability. ? - Health Article Forum-Discussion about health care and Health article in Health Article Forum

All Green theme by © MustangV8.com. Powered by SMF 1.1.5 | SMF © 2006-2008, Simple Machines LLC