super cool study material sites that u should go to if u need to study

http://www.gomath.com/htdocs/lesson/statistics_lesson1.htm

http://regentsprep.org/Regents/math/mean/measure.htm

http://www.jr2.ox.ac.uk/bandolier/booth/glossary/mean.html

http://www.easycalculation.com/statistics/mean-median-mode.php

http://www.cimt.plymouth.ac.uk/projects/mepres/book8/bk8i5/bk8_5i2.htm