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tutor2 : Hello Student, May I help you with your Math problems?
student : yes please
student : Age at onset of dementia was determined for a sample of adults between the ages of 60 and 75. For 15 subjects, the results were ΣX = 1008, and Σ(X-M)2 = 140.4. Use this information to answer the following: Based on the data you have and the Normal Curve Tables, what percentage of people might start to show signs of dementia at or before age 62? A neuropsychologist is interested only in studying the most deviant portion of this population, that is, those individuals who fall within the top 10% and the bottom 10% of the distribution. She must determine the ages that mark these boundaries. What are these ages?
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