1. Which of the following functions are cumulative distribution functions? (Hint: Sketch the graph of each function). (a) (b) (c) Fx (x) = Fy (y) = Fr(t) = 1 1, 0, y³, 1, 0, t 2' 1, x < 2, 2 < x < 3, x > 3. y < -1, -1≤ y ≤ 1, y ≥ 1. t < 1, 1 < t < 2, 2 ≤t.
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