Calculate the average density of the earth ?

Volume of the earth, V
= 1.083 × 10¹² km³
= 1.083 × 10¹² × (1 × 10¹⁵) cm³
= 1.083 × 10²⁷ cm³

Mass of the earth, m
= 5.98 × 10²⁷ g

Average density of the earth
= (5.98 × 10²⁷ g) / (1.083 × 10²⁷ cm³)
= 5.52 g/cm³  (to 3 sig. fig.)

Sorry, my answer is "Anonymous" as your post is Anonymous. There is no need for an Anonymous question in this category, Most 'Anonymous' posts are trolls, maybe yours is not, but the high likelihood is there. If you post as yourself, I would be glad to help you with any problem you have.
I spend a lot of time on each problem, I just want to make sure it's for a worthwhile cause.

ρ=M/V = (5.972 × 10²⁴ kg)*(1000g / 1 kg)/[(1.083 x 10¹² km³)*(1.000 x 10¹⁵ cm³/1 km³)]
ρ= 5.514 g/cm³