When lamba = 5

and you want to know the P(x <= 8)

why is P(x<=8) = F(8;5)

but P(x=8) = F(8;5) - F(7;5)

Im confused, i thought the P(x<=8) would equal

the sum from 0 to 8

and P(x=8) would equal F(8;5)

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- Nov 4th 2009, 09:31 AMstatman101Poisson Distrbution quickie
When lamba = 5

and you want to know the P(x <= 8)

why is P(x<=8) = F(8;5)

but P(x=8) = F(8;5) - F(7;5)

Im confused, i thought the P(x<=8) would equal

the sum from 0 to 8

and P(x=8) would equal F(8;5) - Nov 4th 2009, 11:27 AMstatmajor