Question

The results from a mechanical sieve analysis of a dry soil sample are given in the table below. As the soil sample was large it was necessary to sub-sample the material passing the 4.75mm sieve using a riffler. I know how to work out the top part but not the bottom sample.

Sieve size	Mass (g) retained		Cumulitive passing %
19	0
9.5	420
4.75	252
pan	528
TOTAL	1200
riffled sub sample
2.36	36
1.18	30
0.6	21
0.3	12
0.15	15
0.075	6
pan	12
TOTAL	132

Answer 1