Which equation can be used to solve the problem? 180 is 40 percent of what number?
40 x 4.5
100 x 4.5
180
450
180 x0.4
100 x0.4
72
40
o
40x1
180 x 1
40
180
O
100x4.5
40x4.5
450
180

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.