Hamil Coaches Ltd say that their long-distance coaches take 5 hours for a particular journey. Last week

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Hamil Coaches Ltd say that their long-distance coaches take 5 hours for a particular journey. Last week a consumer group tested these figures by timing a sample of 30 journeys. These had a mean time of 5 hours 10 minutes with a standard deviation of 20 minutes.
What report can the consumer group make?

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