Particle Technology

Particle size and distributions

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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	0.0329	0.1393	0.1051	0.2507	0.3058	0.1625	0	1.00
Cumulative mass undersize:	0	0.0039	A

The numerical value for item A is?
a) 0.0039
b) 0.0069
c) 0.0301
d) 0.0367

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