# Poison distribution

• Sep 27th 2006, 04:45 AM
10219929
Poison distribution
I'd appreciate help with the following:

X follows a Posion distribution with an average of = 6.30 Answer to four decimal places not two percentage decimal points.

1. P(x=3)= I got 0.0765

2. P(x>3)= I don't know how to do it.

Thanks.
• Sep 27th 2006, 11:40 PM
JakeD
Quote:

Originally Posted by 10219929
I'd appreciate help with the following:

X follows a Posion distribution with an average of = 6.30 Answer to four decimal places not two percentage decimal points.

1. P(x=3)= I got 0.0765

2. P(x>3)= I don't know how to do it.

Thanks.

P(x>3) = 1 - P(x<=3) = 1 - P(x=0) - P(x=1) - P(x=2) - P(x=3).
• Sep 28th 2006, 12:04 AM
CaptainBlack
Quote:

Originally Posted by 10219929
I'd appreciate help with the following:

X follows a Posion distribution with an average of = 6.30 Answer to four decimal places not two percentage decimal points.

1. P(x=3)= I got 0.0765

looks correct to me.

RonL
• Sep 28th 2006, 06:19 PM
10219929
I finally got P(X>3)= 0.8736, could you guys confirm if I did it right?

Thanks.
• Sep 28th 2006, 06:34 PM
JakeD
Quote:

Originally Posted by 10219929
I finally got P(X>3)= 0.8736, could you guys confirm if I did it right?

Thanks.

It's correct.

FYI, I used the POISSON function in a spreadsheet to get the answer.