Computer chips: A computer chip is a wafer made of silicon that contains complex electronic circuitry made up of microscopic components. The wafers are coated with a very thin coating of silicon dioxide. It is important that the coating be of uniform thickness over the wafer. To check this, engineers measured the thickness of the coating, in millionths of a meter, for samples of wafers made with two different processes.

a. Find the mean of the thicknesses for each process.

b. Find the median of the thicknesses for each process.

c. If it is desired to obtain as thin a coating as possible, is one process much better than the other? Or are they about the same?

Process 1: 90.0 92.2 94.9 92.7 91.6 88.2 92.0 98.2 96.0 Process 2: 76.1 90.2 96.8 84.6 93.3 95.7 90.9 100.3 95.2