The diameter of a sphere is measured using a vernier caliper whose \( 9 \) divisions of main scale are equal to \( 10 \) divisions of vernier scale. The shortest division on the main scale is equal to \( 1 \, \text{mm} \). The main scale reading is \( 2 \, \text{cm} \) and second division of vernier scale coincides with a division on main scale. If mass of the sphere is \( 8.635 \, \text{g} \), the density of the sphere is:
