$2\mathrm{.}56$ On five$-$cycle semilogarithmic paper, plot the grain$-$size distribution curves from the following mechanical

analysis data on six soils; A through F$.$ For each soil determine the effective size as well as the uniformity

coefficient and the coefficient of curvature. Determine also the percentages of gravel, sand silt, and clay

according to $($a$)$ ASTM, $($b$)$ AASHTO, $($c$)$ USCS, and $($d$)$ the British Standard.

Note: Missing data is indicated by a dash in the column.