How...Probability mass function question?

x--------p(x)

-2 ----- 1/3

-1 ------4/27

0 ------1/27

1 ------4/27

2--------1/3

sum of p(x) = 1

Therefore, p(x) is a probability function

your function is p(x) = (|x|+1)^2 / 27

exponent is 2 ; you divide everything by 27

The answer does not prove that p(x) is a probability function.

x p(x)

-2 0.333333333

-1 0.148148148

0 0.037037037

1 0.148148148

2 0.333333333

sum of p(x) = 1

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