Cards are drawn, one at a time, from a standard deck; each card is replaced before...
Cards are drawn, one at a time, from a standard deck; each card is replaced before the next one is drawn. Let Y be the number of draws necessary so that ten of the draws result in spades. Find E(Y).
The answer is 40, I'm just wondering how to get it.
Homework Answers
here this is negative binomial distribution with parameter p=probability of spade =1/4 and r =number of success =10
therefore expected number of cards to be drawn =r/p =10/(1/4) =40
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