http://www.regentsprep.org/Regents/math ... Lesson.htm Source http://www.regentsprep.org/Regents/math ... Lesson.htm http://www.regentsprep.org/Regents/math ... Lesson.htm http://www.regentsprep.org/Regents/math ... Lesson.htm http://www.regentsprep.org/Regents/math ... Lesson.htm normally distributed normal distribution Source a bell curve http://www.regentsprep.org/Regents/math ... Lesson.htm this article