hard · GMAT Verbal
A manufacturer of high-end audio equipment recently upgraded its factory with automated assembly robots. Following the upgrade, the defect rate per 1,000 units dropped from 15 to 4. The plant manager concluded that the use of robots eliminates the errors typically made by human workers during the soldering process.
Which of the following can most properly be inferred from the statements above?
- Every defect that occurred after the upgrade was caused by a mechanical failure of the robots.
- The total cost of production per unit decreased after the factory was upgraded with robots.
- The audio equipment produced by the robots is of a higher overall sound quality than the equipment produced by humans.
- At least some of the defects in the audio equipment prior to the upgrade were the result of human error.
- The robots are capable of performing the soldering process four times faster than human workers.
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