If the duration of heart disease from the onset of symptoms until death ranges from 2 to 29 years, the average is 8.5 years with a standard deviation of 4 years. One administrator of a public medical center randomly selected the medical records of 30 deceased heart disease patients from the medical center's database and records the average duration. Find the probability for : the average duration is between 7.4 and 9.4 years.   Group of answer choices   0.7251   0.8271   0.8351   0.8251

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