dalyadell dalyadell

14-12-2022
Mathematics

contestada

According to Chemical Engineering
Progress
(November 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 fallures at least 10 are due to operator error?
(b) What is the probability that no more than 4 out of 20 such bailures are due to operator error?

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