Answer:
Density = 2.9 g/cm³
Step-by-step explanation:
The density of a substance is given by

From the question
The mass of the stone is 211 g
It's volume is 72 cm³
Substitute the values into the above formula and solve for the density
That's

Density = 2.930
We have the final answer as
Density = 2.9 g/cm³
Hope this helps you