To start, we can express "4 pencils cost $5" as a ratio:
=> 4 pencils : $5
Since we want to find out how many dollars 12 pencils cost, we see that we are multiplying the "pencils" section by 3, so we have to do the same to the dollar side.
Answer: First, draw and label a number line. Then plot the five values that are given above the line. Draw a box from the lower quartile to the upper quartile, with a line dividing it at the median. Then draw lines from the minimum and maximum values connecting to the box to form the whiskers.
