This preview shows page 1. Sign up to view the full content.
Unformatted text preview: over 6 5 tall? (That is taller than 77?) (b) The average height for men in the United States is 70 (5 10). If you meet a 21 year old from The Netherlands, what is the probability that he will be shorter than the average American? (c) How tall would you have to be for 90% of 21 year olds in The Netherlands to be shorter than you? 3. The number of hours for which a lightbulb works before it burns out is normally distributed with mean 5000 hours and standard deviation 200 hours. (a) What is the median number of hours for which a lightbulb works before it burns out? (b) What is the probability that a lightbulb burns out in under 4800 hours? (c) Suppose you have a room where you install ve of these lightbulbs at the same time. What is the probability that at exactly one lightbulb burns out before 4800 hours? 1...
View Full
Document
 Spring '10
 M.Abajian
 Econometrics

Click to edit the document details