https://www.bloomberg.com/markets/rates-bonds/government-bonds/us

US Govt Treasury Bond Yeilds - Bloomberg

As you can see by clicking on the above link, the going yield-to-maturity on a 10 year US Treasury bond is about 2.71% (as of Monday evening).

Does this mean that an investor who buys this bond today will earn a rate of return of 2.71% with certainty? Discuss.

If you are curious about how the yield to maturity on a 10 year T-bond has been changing recently, here is a link to a page that contains a graph of the 10 year T-Bond interest rate:

http://www.cnbc.com/quotes/?symbol=US10Y