Particle Technology

Particle size and distributions

Problems 2.9

Question 2
The following size distribution was obtained for glass spheres by microscope examination. Complete the table rows:

Size range (um): <5 5-7 7-10 10-15 15-20 20-30 30-40 40-50 >50 totals
Number in range: 0 50 150 200 55 45 20 5 0 ------
(mid point)3 . frequency: 0 10800 92100 391000 295000 703000 858000 456000 0 2800000
Relative mass: 0 0.0039 A              
Cumulative mass undersize: 0 0.0039                

The numerical value for item A is?
a) 0.0033
b) 0.0329
c) 0.0629
d) 0.0929

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