A city of Wyandotte is evaluating how its police department's average response time to 911 calls that report violent crime compares to the average response time of similar downriver cities in the metropolitan area. It also wants to compare its average response time to a national standard (benchmark) of six minutes. Avg. Response Time (minutes) Taylor 9 River Rouge 6.2 Dearborn Heights 11.3 Wyandotte 5.2 Southgate 8.2 Dearborn 4.9 Riverview 6.6 Melvindale 4.2 Lincoln Park 7 Allen Park 7.4 What is the mean value in minutes of the average response times among these 10 downriver communities