if lambda equals 1/50 (flaws per yards) and 50 yards inspected,

>>8819778
Lolz poisson means fish in French so nerdy xD

>>8819791
such insightful help

>>8819778
I think you need to include the yards that have 0 flaws in your analysis. Pr(X=0)+...+P(X=2)=P(X<=2) if I am not retarded.

If this is not enough maybe I misunderstood something.

>>8819778
So much for a board for math and science. What a useless board.

>>8819829
Is there a deeper explanation, because I still can't see the justification. Because it clearly states number of yards that have one or more.

>>8819834
There is a deeper explanation. Pr(X=n) is read as "the probability that the random variable X is equal to n".

I assumed that your random variable stood for the number of yards that have at least one flaw. Please let us note that if your poisson distribution is a model for the number of yards that are flawed then this analysis is not adequate.

When I took probability one of the books we used was Ross introduction book on probability. It covered the practical stuff, so it may be appropiate for this situation.

>>8819854
therefore 0 is not included?

>>8819868
In order to know the probability that there are at most 2 flawed yards we need to add the probabilities of there being 0,1 and 2 flawed yards. If you are assuming this process follows a Poisson distribution then the above should hold, therefore 0 should be included.

>>8819912
I appreciate it. It makes more sense now.

What has fish to do with poison? Are so many fish poisoned?

>>8819995
Yes