please include the drawing ellustratios too

If the hydrometer is to be constructed with a cylindrical floating rod, Nine fiduciary marks are to be placed along the rod to indicate densities of 0.98 g/cm', 1.00 g/cm", 1.02 g/cm, 1.04 g/cm.... 1.14 g/cm'. The row of marks is to start 0.200 cm from the top end of the rod and end 1.80 cm from the top end. Determine: (2.2) The required length of the rod; (2.3) The average density? (2.4) should the marks be equally spaced? Explain your answer. 10 99 100 102