Question

17. Running times for 400 meters are Normally distributed for young men between 18 and 30 years of age with a mean of 93 seconds and a standard deviation of 36 seconds. If a man's running time puts him in the upper quartile of running times, that man is:

Answer 1

You can play around with Z table stuff at

http://davidmlane.com/hyperstat/z_table.html