The values listed below are waiting times (in minutes) of customers at two different banks. At Bank A, customers enter a single waiting line that feeds three teller windows. At Bank B, customers may enter any one of three different lines that have formed at three teller windows. Answer the following questions.

Bank A	6.3	6.6	6.7	6.8	7.1	7.2	7.6	7.7	7.7	7.7
BankB	4.1	5.5	5.7	6.2	6.8	7.7	7.7	8.5	9.3	10.0

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Construct a 90% confidence interval for the population standard deviation at Bank A.

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___min

(Round to two decimal places as needed.)