Binomial Distribution

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Homework Statement


http://puu.sh/epl6 [Broken]
Answer
http://puu.sh/eplm [Broken]


Homework Equations





The Attempt at a Solution


No clue on how to attempt this problem. Any help would be appreciated, thanks!
 
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Answers and Replies

  • #2
Ray Vickson
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Homework Statement


http://puu.sh/epl6 [Broken]
Answer
http://puu.sh/eplm [Broken]


Homework Equations





The Attempt at a Solution


No clue on how to attempt this problem. Any help would be appreciated, thanks!
(a) What is the formula for [itex] f(k) \equiv \Pr\{X = k|X \geq 2 \},[/itex] for k = 2, 3, ...,n? Then [itex] E(X | X \geq 2) = \sum_{k=2}^n k f(k), [/itex] and you ought to be able to get the cited formula from this.
(b) What is the formula for σ in terms of n and p? Look at it carefully.

RGV
 
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