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From the chart we have
D10 = 0.2
D30 = 0.45
D60 = 1.20
So
Coefficient of uniformity is = D60/D30
Cu = 1.20/0.2 = 6.0
And
Coefficient of curvature of the soil is = D302/(D10 x D60)
Cc = 0.452/(0.2 x 1.2)
= 0.84375
(iv)
From the particle size distribution chart we can see that the particles are distributed over a wide range. So, this is a well graded soil.

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