suppose there is an urn containing c yellow balls and d green balls. we draw k balls without replacement, from the urn. find the expected number of yellow balls drawn.
I wrote out my random variables: X_1 + X_2 + ... + X_c but I'm having trouble finding the probabilities
The mean of a hypergeometric is the same as a binomial, the variances are different.
Hypergeometric distribution - Wikipedia, the free encyclopedia
The mean here should be