What is probability a weld machine indicates to defective


Assignment:

A machine to detect improper welds in a fabricating shop detects 80 percentage of all improper welds but it also incorrectly indicates an improper weld on 5 percentage of satisfactory welds. Past experience indicates that 10 percentage of all welds are improper. What is the probability that a weld which the machine indicates to be defective is in fact satisfactory?

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