AP chem dimentional analysis question!?

Question

So i know this is probably a pretty easy question for an AP class, but most of chemistry last year isn't coming back to me very easily and i've been struggling through this question. it's-The density of air at normal atmospheric pressure at 25 degrees C is 1.19 g/L. What is the mass in kilograms, of the air in a room that measures 12.5x15.5x8.0 ft?

okay i got my answer to be 1.8445 kg, using the density formula. and my cousin who's a doctor got a little over 5 to be her answer. so i'm not sure how to do it or which one is right. if there's any smart chemistry people out there i'd appreciate all the help i can get. thank you so much ahead of time! sorry for being dumb at this kind of stuff.

Answer 1

12.5 ft x 15.5 ft x 8.0 ft x 28.3 L/ft³ x 1.19 g/L  x 1 Kg/1000 g=52.2 Kg

=52 Kg(2 sig figs)