A basketball team played six games. In those games, the team won by 7 points, lost by 7, won by 9, won by 10, lost by 2, and won by 13. What was the mean difference in game scores over the six
games?
The mean difference in game scores over the six games was

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.