Question 3 The ogive shows the grain size distribution curve for a sample of soil. 100 90 -Clayey Sand 10 80 20 70 30 60 40 50 50 Percent finer by weight Percent coarser by weight 40 60 30 70 20 80 10 90 100 0 0,001 0,01 0,1 10 100 Grain size [mm] a) Find the median, lower quartile, upper quartile and range from the graph. b) Sketch on the graph the grain size distribution curve for a sample of silty sand which has the same range but a higher mean grain size