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Imagine that a researcher wanted to know the average weight of 5th-grade boys in a high school

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Imagine that a researcher wanted to know the average weight of 5th-grade boys in a high school. He randomly sampled 5 boys from that highschool. Their weights were: 120 lbs, 99 lbs, 101 lbs, 87 lbs, 140 lbs. What's the standard error of the mean?