8. Specifications for a part that fits into a toy action figure call for one of the dimensions to be 2.145 plus or minus 0.006 inch. The variation in the equipment and processing results in a standard deviation of 0.004 inch for this dimension. —

a. What percentage of the parts will be outside the specification if the process is centered properly?

b. What percentage of the parts will be out of spec if the process is actually centered at 2.143 inches?