There's a story problem and 3 questions

timer Asked: Feb 5th, 2015

Question description

Suppose that the average age of adult population is 45 years with an standard deviation of 20 years. Assume that the age is approximately normally distributed.

 A) a person who is 40 years old falls on what percentile?
 B) If someone is 85th percentile in age, how old is she?
C) If someone is 15th percentile in age, how old is she?

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