How do I find the mass density of a sphere?

Heres an example:

 

Can any one help me find the mass density of a sphere the sphere has a diametor of 95mm. I need to convert my answer in to g/cm3 and kg/m3?

 

Density = Mass / Volume 
Volume = (4/3)πr³ = (4/3)π(95/2)³ = 448920.5 mm³