Tino conducted a survey of all the eighth graders in his school for his math project. He asked each student how much he or she spent on school supplies
at the beginning of the year (rounded to the nearest dollar). He also calculated
the average amount spent and found it to be $15.50. Unfortunately, it rained
on the day he brought the graph to turn it in, and the last bar got smudged.
What is the height of the smudged bar?