It's not possible.
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density=mass/volume volume=mass/density
Density is defined as mass per unit volume. In this particular question, the information on volume is not given. Whereas three linear measures are required to calculate a volume, only one is given. It is therefore not possible to determine the volume and so not possible to give an answer.
Since no further information is given, we can only say that mass=density x volume x acceleration due to gravity.
The coefficient of friction is the tangent of the angle theta where the angle is measured from horizontal when the mass first starts to slip
You need to know the area of that cross-section. Once you have that number, the volume of the box is the product of (cross-section area) x (height).