The table below displays returns associated with a company's shares over the last 15 years Year Year Return Return Return (% pa) (% pa) Year (% pa) 2005 26 2011 26 2016 4 2007 25 2012 10 2017 -5 2008 9 2013 20 2018 9 2009 4 2014 31 2019 3 2010 8 2015 33 2020 5 Based on this store data calculate the expected return on the shares and its standard deviation. Give your answer as a percentage per annum to 2 decimal placer a) Expected return b) Standard deviation