Materials of constraction

$\backslash$table$[[$Standart Sieve Size.,Amount Retained on Each Sieve.$],[63,0],[345,2685],[16,1125],[8,1835],[4,1035],[2,0],[1,0],[0\mathrm{.}5,1500],[0\mathrm{.}25,1530],[$Pan$,290]]$

a$)$ What is maximum aggregate size of this sample?

b$)$ Draw the gradation curved on the chart provided?

c$)$ What percentagle of this aggregate sample consists coarse aggregates?