A teller at a drive-up window at a bank had the following service times (in minutes) for 20 randomly selected customers: SAMPLE 1 2 3 4 4.5 4.6 4.5 4.7 4.2 4.5 4.6 4.6 4.2 4.4 4.4 4.8 4.3 4.7 4.4 4.5 4.3 4.3 4.6 4.9 Select a chart to monitor the central tendency of the process, what are the 3-sigma control limits using a mean chart? Keep 3 decimal places.   Select one: a. LCL = 4.212, UCL = 4.788 b. LCL = 4.414, UCL = 4.586 c. LCL = 4.245, UCL = 4.755 d. None of the other options. e. LCL = 4.385, UCL = 4.615

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8. 

A teller at a drive-up window at a bank had the following service times (in minutes) for 20 randomly selected customers:

SAMPLE

1

2

3

4

4.5

4.6

4.5

4.7

4.2

4.5

4.6

4.6

4.2

4.4

4.4

4.8

4.3

4.7

4.4

4.5

4.3

4.3

4.6

4.9

Select a chart to monitor the central tendency of the process, what are the 3-sigma control limits using a mean chart? Keep 3 decimal places.

 

Select one:
a.

LCL = 4.212, UCL = 4.788

b.

LCL = 4.414, UCL = 4.586

c.
LCL = 4.245, UCL = 4.755
d.

None of the other options.

e.

LCL = 4.385, UCL = 4.615

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