What is the value of Cpm?

• A. \(C_{pm}=\frac{USL+LSl}{6σ}\)
• B. \(C_{pm}=\frac{USL-LSl}{6σ}\)
• C. \(C_{pm}=\frac{USL+LSl}{6τ}\)
• D. \(C_{pm}=\frac{USL-LSl}{6τ}\)