A recipe for 12 apple cinnamon muffins calls for 1 cup of flour. The number of muffins that can be made varies directly with the amount of flour used. There are 1 3/4 cups of flour available. How many muffins can be made?

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.