What is the probability that the typist makes at least four


When typing a report, a certain typist makes ierrors with probability pi(i= 0 ),where

p0.20 ,p1.35 ,p2.25 ,p3.15 .

What is the probability that the typist makes

  1. at least four errors;

  2. at most two errors?

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Financial Econometrics: What is the probability that the typist makes at least four
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