what is the relationship between permeability and normal deviation? what are normally distributed distributions why is permeability always normally distributed why is variability often more tightly distributed how does permeability relate to normal variability why is permeability a variable what is the measure of variability of calcite what is permeability in chemistry are variability iqrs normal is permeability normally or normally distributed what is the difference between permeability and normality why is the variability qr which variable is highly variable in rock a or b? why is variability more variable than variability why is variability a variable in a rock how to quantify heterogeneity what is the difference between porosity and permeability how to quantify heterogeneity why is variability always tightly distributed is permeability typically nonnormal