Mike Posted February 16, 2008 Report Share Posted February 16, 2008 Can somebody please help me with? If you can, would you explain and explain the steps to solving a problem. If needed i can give the problem out. Reply Link to post Share on other sites More sharing options...
Guest tomat Posted February 16, 2008 Report Share Posted February 16, 2008 It would be much easier to explain given the problem. Reply Link to post Share on other sites More sharing options...
Afterglow Posted February 20, 2008 Report Share Posted February 20, 2008 (edited) Like tomat said, it would be easier to explain the given problem but here is some general information and examples: - It deals with discrete distribution in which there is a fixed number of trials with only two possible outcomes (success and failure) - each trial result is independent For example: Let say 220 out of 550 students studies Math SL. If you choose 25 students, what is the probability that 10 of them study Math SL? Then; ( A ) P(Math SL) = 220/550 = 0.4 ( B ) This means that the distribution, X ~ B is (25, 0.4) ( C ) Then when you calculate the bionomial probability using the formula [has put a picture] Where P (X = r) is the function r = (0, 1, 2, 3…sort of ‘x’) n = sample (i.e ‘if you choose 25 students…) n-r = failures p = probability of success q = probability of failure (1 – p) calculation (once again a picture) To calculate the C thing, you can use your calculator the 'nCr' option. I use TI and to access it I go to math - prb. It's the same one you use when calculating bionomial expansions. Another way is to calculate through; P (x = 10) = binompdf(25, 0.4 , 10) = 0,161 (again for TI, then Distr) You can also do this in the 'reverse' part. Let say that the question is instead 'at least 10 of them of them study Math SL' then you need to do (again using word to write so its a picture): ------------ I know this is all very confusing. It took me some time to understand it and basically - practising makes things easier to understand. I recommend that you read your math books again and again and try the questions Edited February 20, 2008 by Afterglow Reply Link to post Share on other sites More sharing options...
Mike Posted February 20, 2008 Author Report Share Posted February 20, 2008 Acctually that makes alot more sense then when my teacher tried to explain it. Thanks again you were a big help. Reply Link to post Share on other sites More sharing options...
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