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Unformatted text preview: Balls are drawn from the box without replacement until either a white ball is drawn or 3 balls have been drawn. Find the expected number of balls that will be drawn from the box. Question 5: (a) (3 marks). Let r.v. X have pdf f X ( x ) = e x  / 2 , < x < . Find E ( X ). 1 (b) (2 marks). Let r.v. X have pdf f X ( x ) = ( 1 /x 2 , x 1 , , otherwise. Find E ( X ). 2...
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 Spring '11
 peskun
 Math

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