In a particle size distribution experiemtn, a certain soil sample was examined and the size of all particles measured. In this unusual soil only 6 sizes of particles were found, and the percentages of soil particles in the differnent size groups were found to be:
Size(in microns) --- % of soil particles
100 --- 15
300 --- 12
500 --- 18
750 --- 35
1250 --- 15
1500 --- 5
Now, a single particle is selected at random, and its size (X) is measured.
a) Fine the probability density function of the particle size.
b) Give the cumulative distribution function in tabular and graphic form.
c) Find P[400 < X (less than or equal) 1300].
d) Find the mean and standard deviation of the distribution.
I don't expect anyone to answer b) fully, but as for the others, I'd be grateful for help on. Thanks.
2007-02-05
18:14:13
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1 answers
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asked by
pertinential
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