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jaycezhao jaycezhao
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6 years ago
A pizza delivery service wants to track their delivery times. They take eight samples of four deliveries and record the following data. What are the upper and lower control limits of their X-bar chart?
 
  Sample  1 2 3 4 5 6 7 8
  Item 1 21.1 20.2 24.1 22.6 21.2 20.9 22.4 20.9
  Item 2 21.7 20.6 21.7 21.7 24.1 23.5 24.6 24.7
  Item 3 23.0 24.5 23.2 23.0 20.6 22.8 23.4 22.8
  Item 4 20.3 23.5 24.4 25.0 20.7 23.2 23.3 24.5
  Sum 86.1 88.8 93.4 92.3 86.6 90.4 93.7 92.9
 
  A) 24.9, 20.3
  B) 23.8, 21.4
  C) 22.6, 19.5
  D) 21.1, 17.6
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pianoman314pianoman314
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6 years ago
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jaycezhao Author
wrote...

6 years ago
You make an excellent tutor!
byehoe
wrote...

Yesterday
Good timing, thanks!
vernonb
wrote...

2 hours ago
Brilliant ツ
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