If there is a number in the O column, then some questions were left blank. If there is a number in the X column, then some questions had 2 or more equally shaded answers. Check these sheets manually. By default, all questions have a weight of one. It is therefore the average score achieved by those writing the examination.
Standard deviation is a measure of how much the marks are spread about the mean raw score.
A large standard deviation means that the marks were widely spread apart. A small standard deviation means that the marks were all close to the mean raw score. Student Rank Student rank is a measure of a student's place in the class. 1 Thus, a rank of 13 with a score of 68 means that 12 students achieved a mark better than 68. Percentile Percentile is the percentage of the class achieving a raw score lower than that of the student in question.