Select the organism that is not a source of calcareous sediments. Group of answer choices hydrogenous biogenous cosmogenous lithogenousSelect the organism that is not a source of calcareous sediments. Group of answer choices hydrogenous biogenous cosmogenous lithogenous

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.