Find the current through a person and identify the likely effect on her if she touches a 120-V AC source: (a) if she is standing on a rubber mat and offers a total resistance of $300\text{ k}\Omega$ ; (b) if she is standing barefoot on wet grass and has a resistance of only $4000\Omega$.

I agree, but I'm guessing it's a typo in the book. Especially since we would expect much less resistance in the wet grass vs a rubber mat. The book even uses the word "only" which implies it should be less than the first part.

Thank you very much for the comments both of you. Part (b) is meant to show how the current increases with decreasing resistance - the barefoot on wet grass scenario is meant to have less resistance than the rubber mat scenario of part (a), so the $\textrm{k}\Omega$ unit in part (b) is a typo in the textbook, and should be $\Omega$ as written here. All the best, Shaun