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10-11-2022
Mathematics

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a canadian railway company claims that its trains block crossings no more that 5 minutes per train on the average. the actual times (minutes) of 40 randomly selected train blockings of crossings have a mean of 8.130 mins. from a previous study we know that the blocking times follow a normal distribution with variance of 59.75. based on this information a 99% confidence interval for the true mean time that trains block crossings would be

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