There are numerous types of trading and investing strategies on Wall Street. Many utilize statistics and probability theory to gain insight and make decisions.Some are based on the concept of reversion to the mean. This is why The Goldman Sachs Group, Inc. GS is our Stock of the Day. There is a good chance that it reverses and heads lower.The shares traded higher on Tuesday because Goldman blew away earnings estimates. The company stated that it earned $8.40 per share, which was well ahead of the Street's e ...