Mario Kart Wii item probability distributions
The following tables are used in Mario Kart Wii to determine the probability of receiving an item when an Item Box is opened. Like in Mario Kart DS, only the tables for the default case are stored in the game's files; in Mario Kart Wii, it is known as the "Balanced" case. The probability is coded as percentage multiplied by two. The distributions are presented in the order used in the code.
In the races, the item probability distributions are chosen depending on the rank of the driver when the Item Box is opened.
Grand Prix races
These distributions are used in special cases. For example, the 12th distribution is used for the special item boxes in Chain Chomp Wheel. The last four distributions do not allow to obtain any item, it's unclear whether they are actually used or not.
In the battles, the distribution is chosen depending on how many points behind the driver is with respect to the driver with the most point of the opposite team when the item box is opened.
Local Balloon Battle
Local Coin Runners
Online Balloon Battle
Online Coin Runners