Sample means and ranges were obtained for five samples of 10 units per sample from a production process. Assume the process was considered to be in control during the period these samples were collected. The results are as follows: 
LCL for the three sigma X chart for the process is approximately (for a sample size of 10, A2 = 0.31) :
Definitions:
Risk Premiums
The extra return expected by investors for taking on additional risk compared to a risk-free asset.
Systematic Risk
A risk associated with the entire market or a segment of it, which cannot be lessened by diversifying holdings.
Risk-Free Rate
The theoretical rate of return on an investment with zero risk, often represented by the yield of government bonds.
Stock Index
A statistic that reflects the composite value of a selected group of stocks, representing their aggregate performance.
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