Example 1a roll of a die Probability mass function (p.m.f.) X p(x) 1 pX=1=1/6 p(x) 2 PX=2上=1/16 3 pX=31/6 1/6 4 P(X=4)116 1 ll 123456 5 pX=5上1/6 6 pX=6F1/6 ∑P(x)=1 all x Probability mass function (p.m.f.) x p(x) 1 p(x=1)=1/6 2 p(x=2)=1/6 3 p(x=3)=1/6 4 p(x=4)=1/6 5 p(x=5)=1/6 6 p(x=6)=1/6 x p(x) 1/6 1 2 3 4 5 6 ∑ = all x P(x) 1 Example 1a roll of a die