Stephen Becker

Results 2 issues of Stephen Becker

Fix typo (shows up in book too)

I tried running via Binder and it ran into the following error ``` Collecting pandas==0.24.2 (from -r requirements.txt (line 29)) Downloading pandas-0.24.2.tar.gz (11.8 MB) ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 11.8/11.8 MB 34.0 MB/s eta...