$4.$ Using the following data for an unreinforced PCC Pavement slab: $(6$ pt$)$

a$.$ Design strength fc$=4500$ psi

b$.$ Slab thickness$=14$ in

c$.$ The standard deviation for $25$ samples s$=300$

d$.$ Ignore exposure condition

e$.$ Considered air$-$entrained for moderate condition

f$.$ The fineness modulus is $2\mathrm{.}8$

g$.$ Maximum aggregate size is $1$ in and NMA is $1$ in

h$.$ The bulk oven$-$dry specific gravity of CA is $2\mathrm{.}7$

i$.$ Oven$-$dry density of coarse aggregate is $130$ pcf

Determine:

Required compressive strength

w$/$ratio

Coarse aggregate amount $($lb$/$ yd$3)$