Age at onset of dementia was estimated for sample of adults between the ages of 60 and 75. For 15 subjects, the results were SX = 1008, and S(X-M) squared = 140.4. Employ this info to answer the following:
A neuropsychologist is interested only in studying the most deviant portion of this population, that is, those individuals who fall in the top 10% of the distribution. She should find out the ages that mark these boundaries. Determine these ages?