2.4-4. It is claimed that 21% of the ducks in a partic- ular region have patent schistosome infection. Suppose hat nine ducks are selected at random. Let X equal the mber of ducks that are infected. (a) Assuming independence, how is X distributed? (b) Find (i) P(X 2 3), (ii) P(X 1), and (iii) P(X < 4). %3D

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