Question: On the following table, the sample values represent service times in minute. What is the value of the upper control limit (UCL) of the R-chart?

On the following table, the sample values represent service times in minute. What is the value of the upper control limit (UCL) of the R-chart? Sample Number 1 2 3 4 5 Observation Observation Observation Observation Observation 1 2. 3 4 5 10.1 10.6 9.8 9.9 10.9 9.7 9.5 10.3 9.9 10.5 10.1 10.7 9.2 10.0 10.1 9.9 9.8 10.5 10.4 10.1 10.4 10.1 10.9 9.9 10.3 Greater than 0.90 but less than or equal to 0.99 Greater than 2.99 Greater than 1.99 but less than or equal to 2.99 Greater than 0.99 but less than or equal to 1.99 Less than or equal to 0.90

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