Question: 1.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

1.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

What are the 3-sigma control limits using an appropriate control chart?

Select one:

a. LCL = 4.245, UCL = 4.755

b. LCL = 4.212, UCL = 4.788

c. LCL = 4.414, UCL = 4.586

d. LCL = 4.385, UCL = 4.615

e. None of the other options.

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