If M=1000; SD=200. What score do 20% of the test-takers score?
950-1050
or, above 1168
or, below 832
or at least 256 away from 1000
You can play around with Z table stuff at
http://davidmlane.com/hyperstat/z_table.html
or, above 1168
or, below 832
or at least 256 away from 1000
You can play around with Z table stuff at
http://davidmlane.com/hyperstat/z_table.html