A machine is producing a type of circular gasket. The specifications for the use of these gaskets in the manufacture of a certain make of engine are that the thickness should lie between 5.45 mm and 5.55 mm, and the diameter should lie between 8.45 mm and 8.54 mm. The machine is producing the gaskets so that their thicknesses are N(5.5, 0.0004), that is, normally distributed with mean 5.5 mm and variance 0.0004 mm, and their diameters are independently distributed