The Time Required for a Citizen to Complete the 2010

Multiple Choice

The time required for a citizen to complete the 2010 U.S. Census "long" form is normally distributed with a mean of 40 minutes and a standard deviation of 10 minutes. What is the third quartile (in minutes) for the time required to complete the form?

A) 44.75
B) 46.75
C) 47.50
D) 52.50 Using Excel =NORM.INV(.75,40,10) = 46.75, or Q₃ = 40 + 0.675(10) = 46.75 using AppendixC.