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The snowfall (in inches) during the month of January in a particular geographic region is normally distributed with a standard deviation of 16.75. In the

The snowfall (in inches) during the month of January in a particular geographic region is normally distributed with a standard deviation of 16.75. In the last 12 years, the sample average of snowfall is computed as 122.50.

a. Construct a 90% confidence interval of the average snowfall in this region.

b. Construct a 95% confidence interval of the average snowfall in this region.

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