If a 525 g sample of gas is placed into a 425 L container at 728 torr and 205 K, what is the molar mass?

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.