Which of the following is a valid discrete probability distribution? a. X P(X) b

Question

Which of the following is a valid discrete probability distribution?

a. X      P(X)              b. X     P(X)               c. X      P(X)

    2      .35                     5      .15                     1      -.25

    3      .25                      7      .35                     2      .85

    4      .30                      9      .40                     3      .20

    5      .15                     11     .10                     4      .20      

          1.05                             1.00                           1.00

Explanation / Answer

Option b is correct answer because

Probability always lies between 0 and 1 never negative.

Sum of all P(x) = 1 should not exceed

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