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MMLU / At a large hospital, the durations of emergency room visits, from check-in to…

Problem

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question

At a large hospital, the durations of emergency room visits, from check-in to discharge, are approximately normally distributed with a mean of 167 minutes and a standard deviation of 76 minutes. Which interval, to the nearest minute, contains the middle 80% of durations?

choices

  1. 15 minutes to 319 minutes
  2. 53 minutes to 281 minutes
  3. 70 minutes to 264 minutes
  4. 91 minutes to 243 minutes

subject

high_school_statistics

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Official source

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