Given a list of 10 numbers, the variation is determined and then the standard deviation, using the flow chart set down. The standard deviation difference from the mean for the numbers, and its meaning was discussed. A list of 10 exam scores given, one being the students. Variation, standard deviation, and z score determined. A bell curve was constructed using that information and the % of students within in area of the bell shown. Grades were assigned depending on the how many standard deviations from the mean each student's raw grade was. 3 other examples were then worked out.