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This numbers correspond to the durations of a sample of 12 units corresponding to a part...

This numbers correspond to the durations of a sample of 12 units corresponding to a part of the ventilation system of a airplane.
If we assume normality, the construct a 90% confidence interval for the mean an a 90% confidence interval for the variance
541,580,455,630,520,567,598,569,665,579,559,577
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