In baseball statistics, bases on balls per 9 innings pitched (BB/9IP) is the mean of bases on balls, (or walks) given up by a pitcher per nine innings pitched. It is determined by multiplying the number of bases on balls allowed by nine and dividing by the number of innings pitched. As with many sports, and perhaps even more so, statistics are very important to baseball. ... In statistics, mean has two related meanings: the average in ordinary English, which is more correctly called the arithmetic mean, to distinguish it from geometric mean or harmonic mean. ... In baseball statistics, a base on balls (BB), also called a walk, is used in baseball to track the performance of pitchers and batters. ... In baseball statistics, a base on balls (BB), also called a walk, is used in baseball to track the performance of pitchers and batters. ... A baseball pitcher delivers the ball to home plate In baseball, the pitcher is the player who throws the baseball from the pitchers mound toward the catcher to begin each play, with the goal of retiring a batter who attempts to either make contact with it or draw a... In baseball, innings pitched (IP) are the number of innings a pitcher has completed, measured by the number of batters and baserunners that are put out while the pitcher is in the game. ...