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Suppose that it is known that the weights of parcels delivered by a courier company have a normal distribution with a standard deviation of 2.5kg.A

Suppose that it is known that the weights of parcels delivered by a courier company have a normal distribution with a standard deviation of 2.5kg.A random sample of 20 parcels sent by an accounting firm had a mean weight of 10 kg Determine the 95% confidence interval for the population mean weight of parcels

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