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 6.5 6.6 6.7 6.8 7.1 7.2 7.4 7.8 7.8 7.8   Bank B 4.1 5.3 5.9 6.2 6.7 7.6 7.6 8.6 9.2 10.0                                                                                                                                                                                         A.  Construct  a 90​%confidence interval for the population standard deviation σ at Bank A                                                                                                                                                                     _____min

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