# Math Help - Find the probability distribution....

1. ## Find the probability distribution....

Tv's are manufactured in lots of 200, 9 of these are tested and if none are faulty then the lot is accepted, find the probability distribution of the number of faulty televisions assuming there are 20 in a lot.

Help :/ Is this the poisson distribution?

2. ## Re: Find the probability distribution....

Sounds like a hypergeo
But it seems that you want the distribution of the number of bad tvs selected

$P(X=x)={{20 \choose x}{180\choose 9-x}\over{200\choose 9}}$

where x=0,1,...9.
That took forever to type on a lame ipad with a lousy connection at an airport.

3. ## Re: Find the probability distribution....

Originally Posted by matheagle
Sounds like a hypergeo
But it seems that you want the distribution of the number of bad tvs selected

$P(X=x)={{20 \choose x}{180\choose 9-x}\over{200\choose 9}}$

where x=0,1,...9.
That took forever to type on a lame ipad with a lousy connection at an airport.
Thank you.

I really need to sharpen up on identifying which distribution it is. Any tips?

4. ## Re: Find the probability distribution....

you do know how to get to carnegie hall?
practice practice practice

5. ## Re: Find the probability distribution....

Originally Posted by matheagle
you do know how to get to carnegie hall right?
practice practice practice
Haha, practice I must and practice I will.

6. ## Re: Find the probability distribution....

Originally Posted by matheagle
That took forever to type on a lame ipad with a lousy connection at an airport.
I'm guessing that at least it gave you something to do while waiting.

Originally Posted by matheagle
you do know how to get to carnegie hall right?
practice practice practice