Question: cumulative distribution function how to calculate?
Answer: Pr(X ≤ 1) = 1/6.
Pr(X ≤ 2) = 2/6.
Pr(X ≤ 3) = 3/6.
Pr(X ≤ 4) = 4/6.
Pr(X ≤ 5) = 5/6.
Pr(X ≤ 6) = 6/6 = 1.