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When typing a report, a certain typist makes i errors with probability pi (i 0), where p0 = .20, p1 = .35, p2 = .25,

When typing a report, a certain typist makes i errors with probability pi (i 0), where p0 = .20, p1 = .35, p2 = .25, p3 = .15. What is the probability that the typist makes (a) at least four errors; (b) at most two errors?

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