A bucket has three marbles.  Two are black and one is white.  You keep drawing until you get a while marble.  Every time you draw a black marble you put it back into the bucket and also add a new white marble to the bucket.  The random variable X denotes the total number of marbles you have drawn from the bucket. Find P(X = k) as a function of k. Compute E(X).

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section4.6: Variation
Problem 4E
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A bucket has three marbles.  Two are black and one is white.  You keep drawing until you get a while marble.  Every time you draw a black marble you put it back into the bucket and also add a new white marble to the bucket.  The random variable X denotes the total number of marbles you have drawn from the bucket.

  1. Find P(X = k) as a function of k.
  2. Compute E(X).  
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