Excel, om

http://homes.ieu.edu.tr/eada/xmba507_files/Ch4_Problems_and_Cases.pdf

need 4.7 4.9(compute mad for forecasting models)

and 4.25

http://essaymart.net/blog/the-following-gives-the-number-of-accidents-that-occurred-on-florida-state-highway-101-during-the/

needs to be done in excel, with formulas thanks