The number (N) of floods expected to occur during the project life of 50 years is as follows: p(0 floods) = 0.2, P(1) = 0.25, P(2) = 0.2, P(3) = 0.15, P(4) = 0.1, P(5) = 0.05, P(6) = 0.03, and P(7) = 0.02. Graph the mass and cumulative mass curves. Based on the expected frequency concept, what are the following probabilities: (a) P(N > 3), (b) P(N<3) and (c) P(2 ≼ N<5)?
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