S2 Poisson Distribution help! Watch

~the_one~
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#1
Report Thread starter 13 years ago
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Hey I totally get the idea behind Poisson distribution but i'm just stuck on how you do one kind of question.

If X ~Po(2.5), find P(X>2)?

I've tried doing 1- (P(1) + P(0)) but i'm deffinatly going wrong somewhere.

Also could anyone just explain in general how to work them out if a question asks P when X is not equal to r and is greater, smaller than etc, (our teacher ran out of time)

Thank you so much.
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~the_one~
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Report Thread starter 13 years ago
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Hey I totally get the idea behind Poisson distribution but i'm just stuck on how you do one kind of question.

If X ~Po(2.5), find P(X>2)?

I've tried doing 1- (P(1) + P(0)) but i'm deffinatly going wrong somewhere.

Also could anyone just explain in general how to work them out if a question asks P when X is not equal to r and is greater, smaller than etc, (our teacher ran out of time)

Thank you so much.
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oceane
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Report 13 years ago
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You're on the right track - it should be 1-( P(2) + P(1) + (P0) ) as the question asks for the probability of it being greater than 2, not greater than or equal to 2.
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oceane
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You're on the right track - it should be 1-( P(2) + P(1) + (P0) ) as the question asks for the probability of it being greater than 2, not greater than or equal to 2.
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~the_one~
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Report Thread starter 13 years ago
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Thank you so much, gah i dont believe how hard that took me, silly mistake!
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~the_one~
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Report Thread starter 13 years ago
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Thank you so much, gah i dont believe how hard that took me, silly mistake!
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