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It is known that the age of patients in a hospital in the middle of the...

It is known that the age of patients in a hospital in the middle of the country is normal, with a 45 expectation and a standard deviation of 18. A random sample of 35 patients was selected. Consider the following probabilities: 1. The average of the sample shall be at least 40. 2. The deviation of the sample mean from the population mean shall be less than 2.2.

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