Programming, Statistics.
0.050 0.995 3 5 0.005 1.000 The 1 th roll produces : 4 star rarity item. The 2 th roll produces : 3 star rarity item. The 3 th roll produces : 3 star rarity item. The 4 th roll produces : 3 star rarity item. The 5 th roll produces : 3 star rarity item. ... The 16 th roll produces : 3 star rarity