$12\mathrm{.}9$ What social media tools do marketers commonly use? A survey by Social Media Examiner of B$2$B marketers $($marketers that focus primarily on attracting businesses$)$ and B$2$C marketers $($marketers that primarily target consumers$)$ reported that $267(81\%)$ of B$2$B marketers and $295(44\%)$ of B$2$C marketers commonly use LinkedIn as a social media tool. The study also revealed that $149(45\%)$ of B$2$B marketers and $308(46\%)$ of B$2$C marketers commonly use YouTube as a social media tool.

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

Uses Linkedin commonly

Does not use Linkedin commonly

:: $185\mathrm{.}46$

:: $376\mathrm{.}54$

:: $144\mathrm{.}54$

:: $293\mathrm{.}46$

:: $367\mathrm{.}40$

:: $492\mathrm{.}53$

:: $653\mathrm{.}73$

:: $838\mathrm{.}81$