# Binomial Distribution

## Homework Statement

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

## The Attempt at a Solution

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

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Ray Vickson
Homework Helper
Dearly Missed

## Homework Statement

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

## 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 $f(k) \equiv \Pr\{X = k|X \geq 2 \},$ for k = 2, 3, ...,n? Then $E(X | X \geq 2) = \sum_{k=2}^n k f(k),$ 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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