(Step-by-Step) The average duration of Alzheimer's disease is 8 years and the standard deviation is 4 years. For a clinical study, 30 patients are randomly selected


Question: The average duration of Alzheimer's disease is 8 years and the standard deviation is 4 years. For a clinical study, 30 patients are randomly selected that have been determine to be at the very beginning stage of the disease. What is the probability that the average duration of the disease among the sampled patients will be less than 7 years?

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