urn contains 4 white and 6 red rolls. Four balls are drawn at random (without replacement) from the urn. Find the probability distribution of number of white balls?

Question

terenzreignz · Answer

This follows a hypergeometric distribution.
Its probability density function is given by
$$\huge \frac{\left(\begin{matrix}N \ n\end{matrix}\right)\left(\begin{matrix}K-N \ k-n\end{matrix}\right)}{\left(\begin{matrix}K \ k\end{matrix}\right)}$$
Where N is the number of favourable outcomes, n is how many such draws are needed, and K is the total number of outcomes.

anonymous · Answer

how to solve it

terenzreignz · Answer

What is your favourable outcome?  Drawing a white ball, right?

anonymous · Answer

4/10

terenzreignz · Answer

No, just 4.  There are 4 white balls, so N = 4.

anonymous · Answer

oh yes, i calculate probability of white balss

anonymous · Answer

can any body solve this in simple form so that i can understand

perl · Answer

we can do it in steps

perl · Answer

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