Unformatted text preview: ( 20 2 ) pairs of tomatoes. There are exactly 10 × 10 pairs consisting of one red and one yellow tomato. Therefore, P ( X k = 1) = 10 · 10 ( 20 2 ) = 100 190 = 10 19 and E ( X k ) = 10 19 for k = 1 , . . . , 10 . Hence E ( X ) = 10 · 10 19 = 100 19 ≈ 5 . 26 . Answer: E ( X ) = 100 / 19. 1...
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 Winter '12
 AlexanderBarvinok
 Probability, random variables X1

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