first we would find the area of the 2 triangles, formula is 1/2bh. which would give you 12, since there is 2 triangles would be 24. then you would find the area of the 3 rectangles around it which are 42, 35 and 35.
For every number given put one dot above the number on the number line. Ex. 10 would have one dot above it, 17 would have 3 dots above it. Pretty easy to do. Just count how many numbers of each temperature, then plot them.