The electron in a hydrogen atom is typically found at a distance of about 5.3 10-11

Question:

The electron in a hydrogen atom is typically found at a distance of about 5.3 × 10-11 m from the nucleus, which has a diameter of about 1.0 × 10-15 m. If you assume the hydrogen atom to be a sphere of radius 5.3 × 10-11 m, what fraction of its volume is occupied by the nucleus?