What is the expected value of this question?

Asked May 20 '20 at 11:22

Active May 20 '20 at 12:14

Viewed 25 times

There is a lottery system with 12 kinds of cards. Everyday I'm allowed to take one card from the system and the odds of taking each kind of cards is equal(1/12).The number of each kind of cards is unlimited. Once I collect all 12 kinds of cards I'll get a reward. So the question is how many days are expected to take to collect all kinds of cards?

Which tool should I use to solve this question?

edited May 20 '20 at 12:14

Henry

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asked May 20 '20 at 11:22

michelle2012

1

It sounds like you're describing the coupon collector's problem. – Théophile May 20 '20 at 11:27
Can probability say the exact days to collect 12 cards – Namburu Karthik May 20 '20 at 11:29
@NamburuKarthik I may not describe the question well. The question is to compute the expected value / average days to collect the set of cards. – michelle2012 May 20 '20 at 11:35
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@Théophile That's exactly what I need, Thanks! – michelle2012 May 20 '20 at 11:39

What is the expected value of this question?

0 Answers0