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* Description/Instructions. The familiar measures of center (mean, median, mode) and spread (range, standard deviation, variance, and interquartile range) will generally not be directly tested on the AP exam, because you can determine these so easily on your calculator. Description/Instructions. The familiar measures of center (mean, median, mode) and spread (range, standard deviation, variance, and interquartile range) will generally not be directly tested on the AP exam, because you can determine these so easily on your calculator.
Skewed left distributions and/or datasets with low outliers: Mean (XÌ) is always less than median (M). (XÌ M) Let's Summarize. The two main numerical measures for the center of a distribution are the mean (XÌ) and the median (M). The mean is the average of the values, while the median is the middle value. The mean is very sensitive to outliers (as it factors in their magnitude), while the median is resistant to outliers. The mean is an appropriate measure of center only for symmetric distributions with no outliers. In all other cases, the median should be used to describe the center of the distribution.