Studies on a machine that molds plastic water pipes indicate that when it is injecting 4-inch diameter pipe, the process standard deviation is 0.05 inches. The pipes have an acceptable quality standard of 4-inch plus or minus 0.15 inch. This process has a 0.3 sigma performance level. Note: Even though we practiced only the integer values of sigma performance (e.g., 1 sigma performance, 2 sigma performance etc.), the answer could be fractional due to the number generated by the computer. But the logic is the same. Type in the answer rounded up to 2-decimal places