19. We have two boxes; there are m white balls and one black ball in the...

19. We have two boxes; there are m white balls and one black ball in the first box, and k white balls and one black ball in the second box. We randomly choose a box (each choice has the same probability) and then draw two balls simultaneously from the chosen box. Let X denote the number of black balls drawn, and Y denote the number of the box that was chosen. Find the correlation coefficient of variables X and Y .

k=21，m=13，n=1

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orchestra answered 1 year ago

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