line 217 was missing /10 in homework #2 item 11

chunk at lines 216 - 218 was reporting 2.92 in show answer.  added / 10 to match .explanation.

TA's and/pr staff - please re run as needed to correct slidify html
Merge pull request #33 from whitefishdontjump/patch-1

line 217 in Rmd was missing ' /10 ' in homework #2 item 11