Distribution function

X 2 3 4
P 0.35 0.35 0.3

The data in this table do I calculate the distribution function F(x) and then probability p(2.5 <ξ <3.25) p(2.8 <ξ) and p(3.25> ξ)

Result

p1 =  0.35
p2 =  0.3
p3 =  0.65

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