The table below displays returns associated with a company's shares over the last 15 years.

Year Return(% pa)

2005 32

2006 19

2007 16

2008 15

2009 15

2010 24

2011 -3

2012 8

2013 25

2014 19

2015 25

2016 7

2017 22

2018 -3

2019 31

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