Chapter 1 - Measurement and Problem Solving - Learning Path Questions and Exercises - Exercises - Page 31: 59

$5.5 \times 10^{3} kg/m^{3}$

Mass of earth $= 5.98 \times 10^{24} kg $ Radius of earth $= 6400 km = 6.4 \times 10^{6} m$ Volume $= \frac{4}{3} \times \frac{22}{7} \times radius^{3}=1.1 \times 10^{21} m^{3} $ Thus, Density $ = \frac{5.98 \times 10^{24}}{1.1\times 10^{21}}=5.5\times 10^{3} kg/m^{3}$