Grain size: a skewed distribution has no single average00.020.040.060.08probability densityLog-spaced bins on a log axis: every bar the same widthas-received (n=2000)median = 11 umarithmetic mean = 12 umarea-weighted mean = 18 um2510205010000.010.020.03grain diameter (um)probability densityafter 4 h at 1050 degC (n=2000)median = 28 umarithmetic mean = 32 umarea-weighted mean = 53 umGrain size: a skewed distribution has no single average