The particle size distribution in the table below was obtained from a cascade impactor. Determine whether the distribution is log-normal. If so, determine the geometric mean diameter (dp 50) and the geometric standard deviation (2) Size range (um) 0-2 2-4 Weight percent (%) 6 23 4-7 30 7-10 18 10 - 15 13 15 - 25 8 25 - 50 1.9 pata) 70 0.01 80 so 04 10 7 0.5 95 02 03 0.05 09 99 66 66 40 30 20 9.99 8 999 99.6 7 6 5 4 99 95 00 66 96 70 90 098 99. 40 20 50 10 OC 09 ts 02 0.01 0.05 0.1 22 05