volume Dow Jones 30 Index (DJI)FXOPEN:WS30MAK4XIn a perfect normal distribution, which the markets never are, 68.26% of all data (in our case trades) occurs within one standard deviation of the mean (point of control). Thus the 70% used by traditionalist when determining fair value. Prices above or below fair value are considered “unfair” prices (i.e., not accurate reflections of the traded security’s true intrinsic value).