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Density is defined as mass per unit volume. Given the graph below with mass (in kg) on the vertical axis and volume (in cubic meters) on the horizontal axis, what is the density of the material represented by the graph?

$15\, kg/m^{3}$

$5.0\, kg/m^{3}$

$3.0\, kg/m^{3}$

$45\, kg/m^{3}$

$22.5\, kg/m^{3}$