4. The specifications for one dimension of part of a ski binding are 1.50 plus or minus 0.002 centimeter. When the manufacturing facility makes parts of this general size, the process has a standard deviation of measurements of 0.0015 centimeter.

a. Calculate the process capability index for this part.

b. Is the process capable of meeting these specifications?

c. If the process is used and is kept centered at 1.50 centimeters, what percentage of the ski binding parts will be outside the specifications for this dimension?