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Mean - Average (symbol mue) Mode - The Number that occurs the most Median - Simply the center of your data after the data was ordered Standard Deviation : i s a measure of the amount of variation or  dispersion  of a set of values (symbol Sigma  A low standard deviation indicates that the values tend to be close to the  mean  (also called the expected value) of the set,  high standard deviation indicates that the values are spread out over a wider range. SD is the square root of variance SD is commonly used to measure confidence in statistical conclusions Nth Percentiles : The most common way to report relative standing of a number within a data set is by using  percentiles .  Not Same as percentages If your exam score is at the 90th percentile, for example, that means 90% of the people taking the exam with you scored lower than you did (it also means that 10 percent scored higher than you did.) FINDING A PERC...