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A sample preparation for a chemical measurement

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

(a) If a technician is selected randomly to complete the preparation, 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

(a) If a technician is selected randomly to complete the preparation, 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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