Cherry

Using your code as a base, here's a functional version: http://js.do/code/ohgoodgodwhatamidoing2. I also switched up the way you were initialising your `score` array in your `student` function, as that was a little strange. You were almost there! You were parsing the arguments into the `avg` function as strings, but then referencing them as arrays. You already have the data you need, so I just through them through `parseInt` to ensure they were numbers. If the test scores could potentially be floats (numbers such as 3.14), you'll want to parse them through `parseFloat` instead, and likely round the result at the end to 2 decimal places, so to avoid any floating point number issues. You could have also just past the entire `score` array into your `avg` function, and then referenced it as an array by doing `score[1] + score[2]`, etc, rather than creating 4 separate function arguments. I'd recommend reading through https://developer.mozilla.org/en-US/docs/Learn/Getting_started_with_the_web/JavaScript_basics and then http://bdcampbell.net/javascript/book/javascript_the_good_parts.pdf for a more in-depth overview.

HighCharts is great, but it's still only as "pre-built" as Rickshaw, Google Charts, or any other charting library. It simply provides a nice API to do what you want with, and that still requires at least some basic JS knowledge. Chart.js is another simple library I've used in the past, though I still find Rickshaw a lot more flexible. http://www.chartjs.org/docs/ You're more than welcome to throw me a PM if you'd like any assistance.

I've used Rickshaw the past with a lot of success. It's built on top of d3, but makes interactive charts a lot easier to digest. Take a look at http://code.shutterstock.com/rickshaw/ and specifically http://code.shutterstock.com/rickshaw/examples/formatter.html which seems to be very similar to what you're after (though with only data set).