Butch1224, as you are probably aware, the information given above is in psi units. If you want MPa, you need to convert. E is also a function of concrete density. The Australian Code gives an approximation of (density in kg/m^3)^1.5 x .043 fcm^0.5, where fcm is the mean value of compressive strength at the appropriate age. Only an approximation, as any expression for concrete E would be, and should be considered +/- 20%. If you want better data on a given concrete, you have to do testing using a method like the one suggested by DST148.