If 7 aliens have cats and 7 aliens don't what is the square root of the sun a. purple because the earth is round
b. Germany because Hershey's are brown
c. 9 because pencils are to write with
d. 11

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.