Question: In May, four bank tellers were observed as they served a customer at the main counter. The time required to complete the service was measured

In May, four bank tellers were observed as they served a customer at the main counter. The time required to complete the service was measured on each of three days and the results are shown in the table below. Using the table below, determine the upper and lower control limits for an R-chart (control chart).

Observed customer service time (seconds) teller
Fred
Ginger 
Laura
Tom
Mon.
80
120
185
140
Wed.
155
130
135
120
Fri.
120
160
105
80

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