_17. X 4 6 8 10 P(X) -0.6 0.2 0.7 1.5 _18. 3 4 P(X) 4 4 _19. 8 9 12 P(X) _20. 3 7 P(X) 0.3 0.1 0.2 0.4 -0.7 2.

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