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quiz4-key

# quiz4-key - − μ X 2 ← Σ all c c −μ X 2 f X c ←...

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Quiz 4. February 16, 2011 Seat # _________ Name: ___ < KEY > ___ Closed book and notes. No calculator. Circle all correct answers. 1. (2 pts) For a discrete random variable X , the probability mass function is f X (6) = P( X = 6) P( X < 6) P( X 6) P( X > 6) P( X 6) 2. (2 pts) For a discrete random variable X , the cumulative distribution function is F X (6) = P( X = 6) P( X < 6) P( X 6) P( X > 6) P( X 6) 3. (2 pts) For a discrete random variable X , the expected value is E( X ) = Σ i = 1 n x i / n Σ all c c f X ( c ) Σ all c f X ( c ) Σ all x F X ( x ) 4. (2 pts) For a discrete random variable X with mean μ X , the variance is V( X ) = Σ i = 1 n x i 2 / n
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Unformatted text preview: − μ X ) 2 ] ← Σ all c ( c −μ X ) 2 f X ( c ) ← Σ all x ( x −μ X ) 2 f X ( x ) ← 5. (2 pts) For a discrete random variable X with mean μ X , the standard deviation is std( X ) = √ ddddddd Σ i = 1 n x i 2 / n √ d [V( X )] ← E( X −μ X ) E( X 2 ) − μ X 2 ______________________________________________________________________ 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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