The table below displays returns associated with a company's shares over the last 15 years. Return Year Year (% pa) Return (% pa) Return Year (% pa) 2005 -5 2010 29 2015 34 2006 2 2011 2 2016 4 2007 3 2012 19 2017 32 2008 -3 2013 15 2018 -3 2009 22 2014 -1 2019 23 Based on this historic data, calculate the expected return on the shares and its standard deviation. Give your answers as a percentage per annum to 2 decimal places. a) Expected return = % pa b) Standard deviation = % pa