20)
a)
P(X <= 2) = P(X = -2) + P(X = -1) + P(X = 0) + P(X = 1) + P(X = 2)
= 1/9 + 2/9 + 3/9 + 2/9 + 1/9
= 1
b)
P(-1 <= X <= 1) = P(X = -1) + P(X = 0) + P(X = 1)
= 2/9 + 3/9 + 2/9
= 7/9
c)
P(X <= -1 or X = 2) = P(X = -2) + P(X = -1) + P(X = 2)
= 1/9 + 2/9 + 1/9
= 4/9
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