The average volunteer ambulance member is 45 years old and has 8 years of service, according to the Democrat & Chronicle article “Unpaid ambulance workers could get ‘pension’” (January 23, 2005). The quoted statistics were based on the Penfield Volunteer Ambulance Squad of 80 members. If the Penfield Volunteer Ambulance Squad is considered representative of all upstate New York volunteer ambulance squads, determine a 95% confidence interval for the mean age of all volunteer ambulance members in upstate New York. Assume the population standard deviation is 7.8 years.