An analysis of a random sample of a type of battery estimated that the mean working time was 184.5 hours with a margin of error of 12.5 hours. Which of the following is the most appropriate conclusion based on this analysis?

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Though several answer choices sound reasonable, we want to avoid drawing extreme conclusions. It is unlikely that every battery will have a minimum workting time of 172 hours. Similarly, it is unlikely all batteries fail before 197 hours.

A margin of error implies some error around the mean. The correct answer choice reflects this and leaves a reasonable amount of room for error (any number from 172 to 197).