you can play around with Z-table stuff here:
http://davidmlane.com/hyperstat/z_table.html
The average travel time to work for a person living and working in Kokomo, Indiana is 19 minutes. Suppose the standard deviation of travel time to work is 4.5 minutes and the distribution of travel time is approximately normally distributed.
What is the travel time to work that separates the bottom 2.5% of people with the median or 50%? Round to the nearest tenth of a minute.
1 answer