/usr/share/racket/collects/mzscheme/ is in racket-common 5.3.6+dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/racket/collects/mzscheme/compiled/
/usr/share/racket/collects/mzscheme/compiled/info_rkt.dep
/usr/share/racket/collects/mzscheme/compiled/info_rkt.zo
/usr/share/racket/collects/mzscheme/compiled/installer_rkt.dep
/usr/share/racket/collects/mzscheme/compiled/installer_rkt.zo
/usr/share/racket/collects/mzscheme/compiled/main_rkt.dep
/usr/share/racket/collects/mzscheme/compiled/main_rkt.zo
/usr/share/racket/collects/mzscheme/compiled/mzscheme_scrbl.dep
/usr/share/racket/collects/mzscheme/compiled/mzscheme_scrbl.zo
/usr/share/racket/collects/mzscheme/examples/
/usr/share/racket/collects/mzscheme/examples/README
/usr/share/racket/collects/mzscheme/examples/bitmatrix.c
/usr/share/racket/collects/mzscheme/examples/catch.c
/usr/share/racket/collects/mzscheme/examples/cfile.rkt
/usr/share/racket/collects/mzscheme/examples/curses-demo.rkt
/usr/share/racket/collects/mzscheme/examples/curses.c
/usr/share/racket/collects/mzscheme/examples/fmod-ez.rkt
/usr/share/racket/collects/mzscheme/examples/fmod.c
/usr/share/racket/collects/mzscheme/examples/hello.c
/usr/share/racket/collects/mzscheme/examples/helloprint.c
/usr/share/racket/collects/mzscheme/examples/idmodule.c
/usr/share/racket/collects/mzscheme/examples/makeadder.c
/usr/share/racket/collects/mzscheme/examples/makeadder3m.c
/usr/share/racket/collects/mzscheme/examples/msgbox.rkt
/usr/share/racket/collects/mzscheme/examples/tree-finish.rkt
/usr/share/racket/collects/mzscheme/examples/tree.cxx
/usr/share/racket/collects/mzscheme/info.rkt
/usr/share/racket/collects/mzscheme/installer.rkt
/usr/share/racket/collects/mzscheme/lang/
/usr/share/racket/collects/mzscheme/lang/compiled/
/usr/share/racket/collects/mzscheme/lang/compiled/reader_rkt.dep
/usr/share/racket/collects/mzscheme/lang/compiled/reader_rkt.zo
/usr/share/racket/collects/mzscheme/lang/reader.rkt
/usr/share/racket/collects/mzscheme/main.rkt
/usr/share/racket/collects/mzscheme/mzscheme.scrbl