A large bank establishes X-bar and R charts for the time required to process applications for its

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A large bank establishes X-bar and R charts for the time required to process applications for its charge cards. A sample of five applications is taken each day. The first four weeks (20 days) of data give: (X-double bar)=16 min, (R-bar)=7 min. The UCL, LCL for the X-bar chart is?
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