# Math Help - Poisson Distribution

1. ## Poisson Distribution

Can anyone help me to solve this problem ???

Waiting . . . .

2. Originally Posted by neverlosehope
Can anyone help me to solve this problem ???

Waiting . . . .
In future, please type the question out.

Let X be the random variable 'number of bacterial colonies in a sample'.

X ~ Poisson( $\lambda = 2$).

Calculate $p = \Pr(X \geq 1) = 1 - \Pr(X = 0)$.

Let Y be the random variable 'number of samples that have at least 1 bacterial colony in them'.

Y ~ Binomial(n = 4, p = see above).

Calculate $\Pr(Y \geq 1) = 1 - \Pr(Y = 0)$.

3. Thanks Mr Fantastic

4. X ~ Poisson().

Calculate .
Thanks

5. Originally Posted by neverlosehope
X ~ Poisson().

Calculate .

why we didn't write ut like this ???????

Calculate = 1-Pr(X<0)
What's the point? Can X be less than zero?

6. It's just a mistake , no it can't be less than zero

1-Pr (x<1) = 1-Pr(x=0)

U r Right sorry .

But are u sure we are gonna solve it by possion rule & binomial.

Can we just solve it by possion rule only ????

7. Originally Posted by neverlosehope
[snip]
But are u sure we are gonna solve it by possion rule & binomial.

Can we just solve it by possion rule only ????
If you have so much doubt about the way I have shown you, please feel free to do it your own way.