Yeah, you're right and also sorry for the late comeback. I was able to do part (a) but just couldn't wrap my head around the rest. I don't know how I should approach the Empirical Rule to complete the rest of the parts b,c, and d.
Now in (b) and (c), it's letting me know what the standard deviation is but I'm not sure how to interpret it in my solution. Am I doing the right thing by approaching what's being asked through the std. dev. formula? It's just really bugging me off.
I'll also attach my work here but not much is there to say anything about it, really.