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Drop rates: Difference between revisions
→Calculating the chance of drops
(Created page with "=== What is the chance of dropping a reward? === On many of the guides you will see the drop-rate for a particular reward given. This will typically be expressed as a fraction and a a percentage. For example, the rate of drop-rate for the {{ItemIcon|Chapeau Noir}} in {{Skill|Thieving}} is 1/20,000 (0.005%). The drop-rate of the reward shows you probability of the item dropping, but it is not the same as the chance of the reward being given. For example, if you were...") |
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The probability (P) for a given drop-rate (k) over a fixed number of attempts (n) is given by: | The probability (P) for a given drop-rate (k) over a fixed number of attempts (n) is given by: | ||
<math>P = 1 - \left ( 1 - \dfrac{1}{k} \right ) ^ | <math>P = 1 - \left ( 1 - \dfrac{1}{k} \right ) ^ {n} </math> | ||
If the drop-rate is low, and the number of attempts high (which ''is'' typical for this game) then you can approximate this as: | If the drop-rate is low, and the number of attempts high (which ''is'' typical for this game) then you can approximate this as: | ||