Hey im doing a past paper and i couldnt answer question 7 part 3 http://www.ocr.org.uk/download/pp_09...ce_4732_01.pdf
The part about 4 batches being slescted. The answer to P(X=3) is 0.0853 and P(Xgreater or equal to) is 0.718 Thanks.
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- Thread Starter
- 06-04-2011 15:53
- 06-04-2011 21:47
Let Y=no. of batches that contain at least one second. So Y=0,1,2,3,4.
Since prob(a batch contains at least one second)= 0.718 then Y~B(4, 0.718).
So you want P(Y<3).