Chapter 1 - Matter: Its Properties and Measurement - Example 1-3 - Determining the Density of an Irregularly Shaped Solid - Page 16: Practice Example A

2.76 $g/cm^{3}$

We can deduce the volume of the stone by subtracting the level in the graduated cylinder when the stone was absent from when it was present. We also know that the rock weighs 28.4g. Knowing that density = $\frac{mass}{volume}$, density = \frac{28.4g}{44.1mL - 33.8mL} = 2.76g/mL = 2.76 $g/cm^{3}$