Sieve analysis was performed on 400 gm of dry soil and the weight of soil retained on each sieve is as follows:

Is Sieve size	Wt. of soil retained (gm)
4.75 mm	10
2.00 mm	120
1.00 mm	100
425 μ	70
212 μ	50
150 μ	20
75 μ	30

 

The coefficient of curvature of the soil will be?