The document discusses different types of distributions in graphs of test score data: - Positive skew occurs when a small number of high scores stretch the graph out to the right, with the mean higher than the median and mode. - Negative skew is the opposite, with a small number of low scores stretching the graph left and the mean lower than the median and mode. - A symmetrical distribution has scores evenly distributed on both sides of the median, with the mean, median and mode close together.