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 :/ (Thinking) Is this the poisson distribution?

Re: Find the probability distribution....

Sounds like a hypergeo

But it seems that you want the distribution of the number of bad tvs selected

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

where x=0,1,...9.

That took forever to type on a lame ipad with a lousy connection at an airport.

Re: Find the probability distribution....

Quote:

Originally Posted by

**matheagle** Sounds like a hypergeo

But it seems that you want the distribution of the number of bad tvs selected

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

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?

Re: Find the probability distribution....

you do know how to get to carnegie hall?

practice practice practice

Re: Find the probability distribution....

Quote:

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. ;)

Re: Find the probability distribution....

Quote:

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.

Quote:

Originally Posted by

**matheagle** you do know how to get to carnegie hall right?

practice practice practice

:D