5/17/11 Hwk 6 Additional Problems 1 Hwk 6 Add 1: Investment Return • The rate of return (X) on an investment is normally distributed with mean of 30% and standard deviation of 10%. • What is the probability that the return will exceed 55%? Less than 22%?5/17/11 Hwk 6 Additional Problems 2 Hwk 6 Add 2: Entrance Exam • The time it takes to finish a standard entrance exam is normally distributed with a mean of 60 minutes and a standard deviation of 8 minutes. • What is the probability that a student will finish the exam between 60 and 70 minutes? • How much time does it take for 95% of the students to finish the entrance exam? Is the answer unique? Why?5/17/11 Hwk 6 Additional Problems 3 Hwk 6 Add 3: Women Basketball Players • The heights of young women follow N(64.5, 2.5). • A coach wants to select women basketball players whose heights are among the top 10% of the young women population. What’s the minimum height to be
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