Revise T02b-A1Example

Please fill in the slides for T02b-A1Example. There is a folder for this in the repo, but no of the details have been added, except for a link to the example.

All we need here is the example transformed to slide form. You just need to highlight the interesting parts of the question and the answer on the slides, so as to facilitate discussion in the tutorial.

When you are done, please create an issue for review and assign it to myself, @staplejw and @jiangz26.