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At Quick Car​ Wash, the wash process is advertised to take less than 7 minutes.​ Consequently, management has set a target average of 390 seconds for the wash process. Suppose the average range for a sample of 10 cars is 11 seconds.   Part 2 The UCL Subscript Upper R equals             seconds and the LCL Subscript Upper R equals      seconds. ​(Enter your responses rounded to two decimal​ places.)

At Quick Car​ Wash, the wash process is advertised to take less than 7 minutes.​ Consequently, management has set a target average of 390 seconds for the wash process. Suppose the average range for a sample of 10 cars is 11 seconds.   Part 2 The UCL Subscript Upper R equals             seconds and the LCL Subscript Upper R equals      seconds. ​(Enter your responses rounded to two decimal​ places.)

Practical Management Science
Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
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At Quick Car​ Wash, the wash process is advertised to take less than 7 minutes.​ Consequently, management has set a target average of 390 seconds for the wash process. Suppose the average range for a sample of 10 cars is 11 seconds.

 
Part 2
The
UCL Subscript Upper R equals             seconds and the LCL Subscript Upper R equals      seconds. ​(Enter your responses rounded to two decimal​ places.)
Expert Solution
Step 1

Given,

Average time X¯ = 390 seconds

Average range R¯ = 11 seconds

Sample size n = 10 cars.

At n = 10,

D3 = 0.223

D4 = 1.777 ( These values are from control limits table )

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