Thomson to Sell Media Group for \$350 Mln  OTTAWA (Reuters) - Thomson Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=TOC.TO target=/stocks/quickinfo/fullquote"&gt;TOC.TO&lt;/A&gt; said on Friday it  will sell its media division to investment group Investcorp in  a \$350 million cash deal that will tighten its focus on  electronic publishing.