Add another statistic called 3 sigma. This is simply a value that represents 3 times the standard deviation.

[jayhamilton]

The value should appear beneath the standard deviation in the bar graph. To accomplish this you will build on the work that you have already performed. You will create the following:

1. variable called threeSigma
2. variable for the label
3. create a function that returns 3 times the standard deviation
4. display that value along with the others in the bar chart