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The standard deviation of the amounts filled into bottles by a machine is 2.3 ml. A random sample of size n= 30 are taken and

The standard deviation of the amounts filled into bottles by a machine is 2.3 ml. A random sample of size n= 30 are taken and the mean = 150 is calculated. Construct a 90% confidence interval for the mean amounts in all bottles filled by a machine.

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