Age at onset of dementia was stated for a sample of adults between ages of 60 and 75. For 15 subjects, the results were SX = 1008, and S(X-M)squared = 140.4. Use 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 within the top 10% of the distribution. She must determine the ages that mark these boundaries. What are these ages?