Subtopic: Particle size analysis for comminuted solids
Question Statement:
A sieve analysis was performed on a $250\text{ g}$ ground feed sample using a standard set of 7 Tyler sieves. The cumulative percentages of material retained on the sieves (from coarsest to finest) were $0, 15, 35, 60, 85, 95,$ and $100\%$. The Fineness Modulus ($FM = \frac{\sum \text{cumulative } \% \text{ retained}}{100}$) of the sample is ________ (round off to 2 decimal places).