Question: The average time spent waiting in queue for a bank teller is 8 minutes. The Standard Deviation is 30 seconds. What is the tolerance of

The average time spent waiting in queue for a bank teller is 8 minutes. The Standard Deviation is 30 seconds. What is the tolerance of the process that exhibits the limits of normal variation with 0.3% chance of producing a non-conforming product?

6 to 10 minutes

7 to 9 minutes

6.5 minutes to 9.5 minutes

3 minutes to 12 minutes

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