Unformatted text preview: 4. (2 pt) Determine the value of E( X ). ____________________________________________________________ The Poisson rate is λ = 1 / 1.3 stork sightings per year. The random variable X is exponential. Therefore, from Page 12, E( X ) = 1 / λ = 1 / 1.3 years (per stork) ← ____________________________________________________________ 5. (2 pt) Suppose that a bird watching has been watching for 2 years, with no sighting. Determine the conditional expected value until the next sighting. That is, determine the value of E( X  X > 2). ____________________________________________________________ The exponential distribution is memoryless. Therefore, E( X  X > 2) = E( X ) ← ____________________________________________________________ ______________________________________________________________________ Write on the back any concerns about the weekly quizzes or the course in general. IE 230 – Page 1 of 1 – Schmeiser...
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This note was uploaded on 04/25/2011 for the course IE 230 taught by Professor Xangi during the Fall '08 term at Purdue.
 Fall '08
 Xangi

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