On page 69 ( 73 in the pdf) The formula for precision and recall are the same. But the text description indicates that these are slightly different concepts and should have a different formula.
Both show : tp / ( tp + fp )

Good Point John. Formula for Precision is correct.
For Recall is should be tp/(tp+fn)

I hope this will be corrected.

Thank you for catching this mistake! All fixed!

In V9 error again in recall formula.

You're right... It seems like Manning didn't update the figures to chapter 4. I'll check with them right away.