The city of Richmond is conducting a feasibility study to determine if a high-speed commuter rail system should be added. The number of people commuting into Richmond to work each morning for the past six months are given below: January 2,749,876

February 3,293,874
March 4,923,940
April 3,531,890
May 2,309,870
June 3,103,210
The city will round each month's commuter numbers to the nearest million before finding the total. What is the estimated commuter traffic over the past 6 months?