Over a Twenty Hour Period Forty Samples of Five Items $\bar { \bar { X } }$

question 22

Multiple Choice

Over a twenty hour period forty samples of five items each were collected.From this data, the values calculated for $\bar { \bar { X } }$ and $\bar { R }$ were 120.10 and 45.75 respectively.Based on this data, the upper control limit for the X bar control chart should be set at
Approximately:

• A)120.10
• B)129.43
• C)146.49
• D)165.85

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