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Assignment help 651

A machine to detect improper welds in a fabricating shop detects 80 percent of all improper

welds, but it also incorrectly indicates an improper weld on 5 percent of all satisfactory welds.

Past experience indicates that 10 percent of all welds are improper.

i. What is the probability that a weld that the machine indicates to be defective is in fact


ii. What is the probability that a weld which the machine indicates to be satisfactory is in fact


iii. Compare the probabilities in (a) and (b) and comment on their relative magnitudes.


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