4. a sieve analysis were conducted on a soil sample. the results are given as follows: sieve # opening size (mm) 4.75 10 20 40 60 100 200 pan total remaining mass (gr) 9.7 39.5 71.6 129.1 107.4 105 8.5 1.3 472.1 0.84 0425 025 0.15 0.075 a) determine the percentage of gravel, sand, and fines b) determine the mean diameter c classify the soil sample using the uscs and aashto classification systems