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Density Curves, mean and median AP Statistics A density curve is a curve that • Is always on or above the horizontal axis and, • Has an area of 1 underneath it • Describes the overall pattern of a distribution Mean vs Median and density curves • In a symmetric density curve the mean and the median are the same • In a right scewed curve the mean is to the right of the median • In a left scewed curve, the mean is to the left of the median Mean and Median of Density Curves • The median of a density curve is: the equal-areas point, the point that divides the area under the curve in half • The mean of a density curve is: The balance point, at which the curve would balance if made of solid material Is the following a density curve? • • • • • • • Is it above the horizontal axis? YES Does it have an area of one underneath of it? YES Does it describe the overall pattern of the distribution? OF COURSE IT IS A DENSITY CURVE!