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A six-sided die is rolled, and the number N on the uppermost face is recorded. From...

A six-sided die is rolled, and the number N on the uppermost face is recorded. From a jar containing 10 tags numbered 1,2,...,10 we then select N tags at random without replacement. Let X be the smallest number on the drawn tags. Determine Pr{X=2}and E[X].

for this question, i really want to know why i cant use P(X|N)=P(X=x,N=n)/P(N=n) ????

Math   Statistics-And-Probability   
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Answer #1

Answer:

Given that  Pr{X=2}and E[X].

because there are ways to the tags and these contain two,and these do not contain a one.

To caluculate the expections, use law of total exception

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