Some of the dimensions of a square pyramid are shown in the diagram. The height of the square pyramid is 7.5 meters. What is the volume of the square pyramid in cubic meters?

The coverage of a base station of a telecommunication company forms a disk with a radius of (kilometers). let be the distance of a cellphone from a base station. assume that the location of cellphones in use are randomly uniformly distributed within the disk. calculate the mean and variance for the random variable.