a$.$ Complete the table of expected counts shown below.

B$2$B B$2$C

Uses LinkedIn commonly Response area Response area

Does not use LinkedIn commonly Response area Response area

$185\mathrm{.}46376\mathrm{.}54144\mathrm{.}54293\mathrm{.}46367\mathrm{.}40393\mathrm{.}42492\mathrm{.}53653\mathrm{.}73$