How to estimate average daily flow rate without using spread sheet?

Analyze Xenia's wastewater flow rate data to estimate the following: average daily flow rate, estimated maximum day, estimated peak hour, minimum day, and dry weather flow. Assume the dry season occurs from the beginning of May to the end of September. (Data from Metcalf & Eddy, 2003.) Xenia's flow data, m'/d Year 2006 2007 Population 8,690 9,400 Month January 8,800 13,900 February 6,200 9,900 March 6,800 8,100 April May 4,000 4,200 4,000 3,600 2,400 5,700 3,600 June July August September 2,600 1,500 2,000 2,000 2,800 October 3,200 4,800 4,800 3,200 6,700 November December 5,200