A major of a large city wants to know how long it takes the police in his city to respond to a call for service.In a random sample of 15 citizens who called the police for service, the mayor's research director found that the average response time was 595 seconds, with a standard deviation of 43 seconds.

Using a 95% confidence level, what is the lower bound for this confidence interval?

583.90

575.15

570.35

560.23