If Tony logs-in 10 hours of gaming a day but then Stacey his gf come's in and tells him can either stop gaming or she will leave him for Dave.. SO now how many hours can Tony log-in now that their are no more distractions?

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.