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A dog walker guarantees that he walks the dogs for an average of 3.5 km each time, with a standard deviation of 0.1 km, 19

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A dog walker guarantees that he walks the dogs for an average of 3.5 km each time, with a standard deviation of 0.1 km, 19 times out of 20. An owner tracked the distance walked on 20 walks. What is the minimum average distance to prove that the dog walker lied

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