What is the probability that the typist makes

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Reference no: EM131224992

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

p₀= .20 ,p₁= .35 ,p₂= .25 ,p₃= .15 .

What is the probability that the typist makes

at least four errors;
at most two errors?

Reference no: EM131224992

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