QUESTION $1$

Consider the capability of a process that puts pressurized grease in an aerosol can. The design specs call for an average of $60$ pounds per square inch $($psi$)$ of pressure in each can with an upper

tolerance limit of $67$ psi and a lower tolerance limit of $56$ psi. A sample is taken from production and it is found that the cans average $61$ psi with a standard deviation of $2$ psi.

What is the Cpk $(3$sigma$)$ of the process?

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