Question: Mean= 5.4 Lower Control Limit= 4.8 Upper control Limit= 6 To calculate Cp and CPK I need to find the standard deviation.. How do I

Mean= 5.4

Lower Control Limit= 4.8

Upper control Limit= 6

To calculate Cp and CPK I need to find the standard deviation.. How do I find the standard deviation with these 3 numbers?

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