b. The average cost of processing a computer run at the Palestinian Central Bureau of statistics...

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b. The average cost of processing a computer run at the Palestinian Central Bureau of statistics is $38, with an upper control limit of $46 and a lower control limit of $30. Consider the following four sets of observations: $35,$42,$45,$38.$46 2- $39,$38,$41,$45,$31 3- $31,$33,$41,$42,$46 4- $42,$41,$40,$46,$45 Are they all in control, on what rule would you base your decision? why? (10 marks). b. The average cost of processing a computer run at the Palestinian Central Bureau of statistics is $38, with an upper control limit of $46 and a lower control limit of $30. Consider the following four sets of observations: $35,$42,$45,$38.$46 2- $39,$38,$41,$45,$31 3- $31,$33,$41,$42,$46 4- $42,$41,$40,$46,$45 Are they all in control, on what rule would you base your decision? why? (10 marks).