According to chemical engineering progress nov 1990

According to Chemical Engineering Progress (Nov. 1990) approximately 30% of all pipework failures in chemical plants are caused by operator error.

(a) What is the probability that out of the next 20 pipework failures at least 10 are due to operator error?

(b) What is the probability that no more than 4 out of 20 such failures are due to operator error?

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According to chemical engineering progress nov 1990 : according to chemical engineering progress nov. 1990 approximately 30 of all pipework failures in chemical plants are

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