(2) Answer the questions according to the statistical chart of broken lines:

(1) The best sales in the first half of the year was in June, when 500 units were sold; The worst sales situation was in March, when 80 sets were sold.

② From March to June, sales showed an upward trend, and from June to March, sales showed a downward trend.

From the picture, I also know the following:

As the weather gets hotter, air conditioners are sold more and more.

So the answer is: 6500,3,80,3,6, 1, 3. As the weather gets hotter, air conditioners are sold more and more.