The tensile strength of a welded joint used in construction has to be at least equal to 40 tons per square inch (ton/in.2). A random sample of 100 joints welded by a welding machine yielded the following estimates of the parameters of the distribution of the tensile strengths: Mean = 65 ton/in2. Standard deviation = 8.2 ton/ in2..

Skill/Topic: Statistical Process Control
A) 1.012
Explanation: Cp = [μ- LSL]/ 3σ = [65- 40]/[3*8.2] = 1.012
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