PMP Formula of the Week: Random Defective Article

PMPFormulaOTW475166460

The quality control team raised concerns about the output quality of a specific machine used in your pilot test. You ask the team to provide quantitative data to validate their concerns. The quality control team leader reports that on average 9 of 375 articles produced by the specific machine are defective. What is the probability that an article chosen at random will be defective?

A. 3/125
B. 1/41
C. 1/9
D. 0.24

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