A sample preparation for a chemical measurement is completed correctly by 25% of the lab technicians, com-

Question:

A sample preparation for a chemical measurement is completed correctly by 25% of the lab technicians, com- pleted with a minor error by 70%, and completed with a major error by 5%

(a) If a technician is selected randomly to complete the prepa- ration, what is the probability it is completed without error?

(b) What is the probability that it is completed with either a minor or a major error?

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