(1) As can be seen from the bar chart, the average transaction price in Kecheng District is 3488 yuan/square meter, the maximum and minimum are 1277 yuan/square meter respectively, and the ∴ interval = 3488-1277 = 221/kloc respectively.
(2) The number of sales sets in the old city =493×49%≈242 sets;
(3)( 1420400-434400)÷ 100=9860
9860÷493=20,
A: It takes about 20 months for existing (i.e. unsold) commercial houses to be sold online.