Drop rate

Drop rate is a common but unofficial term used by players to denote the expected amount of an item in relation to all items granted by a random game mechanism in the long run, expressed in percent. Examples for these random game mechanisms are Pro Kit Boxes or daily ad rewards.

Drop rates are closely related to expected values: In other words: The drop rate of an item is its expected value in relation to all items.
 * The expected value is a number and denotes the expected amount of an item.
 * The drop rate is a percentage and denotes the expected amount of an item in relation to all items.