true probability distribution
Which of the following tables represents a true probability distribution? Justify your answer.
X P(x) X P(x) X P(x)
_______________ ____________ ___________
1 0.1 1 0.28 1 0.2
2 0.25 2 0.18 2 -0.22
3 0.15 3 0.11 3 0.39
4 0.3 4. 0.02 4 0.14
5 0.05 5. 0.03 5 -0.13
6 0.14 6. 0.38 6 0.62