Sampling an Infinite Population 4. The life expectancy in the United States is 75 with a standard deviation of 7 years. A random sample of 49 individuals is selected. What is the probability that the sample mean will be larger than 77 years? What is the probability that the sample mean will be less than 72.7 years? What is the probability that the sample mean will be between 73.5 and 76 years?.

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