Identify the lateral area and surface area of a regular square pyramid with base edge length 11 cm and slant height 15 cm, rounded to the nearest tenth. L = 330 cm2 ; S = 451 cm2
L = 330 cm2 ; S = 374 cm2
L = 660 cm2 ; S = 704 cm2
L = 660 cm2 ; S = 781 cm2

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.