\[\large IDW = \frac{\sum \frac{Wi}{Zi}}{\sum \frac{1}{Zi}}\]
\[\large IDW= \frac{\frac{0.022}{2}+\frac{0.011}{1}+\frac{0.033}{3}}{\frac{1}{2}+\frac{1}{1}+\frac{1}{3}}\]
\[IDW = \frac{0.033}{1.83}\]
\[IDW = 0.018\]
IDW = The ore of grade at Xo = 1.8%
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