Anna wants to buy carpet to cover her whole living room, except for the tiled floor. The tiled floor is 6 1
2
ft by 3
1
4
ft. Find the area the carpet needs to cover.

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.