Sorrow

Sorrow is a material dropped from Ghosts in the Dwarven Mines.

Obtaining
Sorrow is a rare drop from Ghosts. This item has a drop rate of 0.12% and is affected by magic find.

Usage
Sorrow can be used to craft Sorrow Armor.

Drop Rate
With a sample of 3000 ghost kills and 21 sorrow drops with 135 magic find, the sample proportion of drops without magic find can be found by multiplying the $$\frac{21}{3000}$$ by $$\frac{1}{2.35}$$ Each drop is independent of the next, and since this is a random variable, we are not sampling without replacement. The expected value of 8.93617021277 is just barely under 9, but because we are rounding up for the distribution model, we barely pass the 9 success/failure condition. A one proportion Z interval can then be calculated. The Standard Deviation of the sample can be calculated with $$\sqrt{\frac{\hat p\hat q}{n}}, \hat p = 0.00298,\hat q = 1 - 0.00298,SD = \sqrt{\frac{(0.00298)(1 - 0.00298)}{3000}} = 0.00099496241$$Our critical value for a 95% confidence interval is 2, so our interval is $$0.00298 \plusmn 2*0.00099496241$$ This evaluates to between ~1% and ~5% for a 95% confidence interval.