Use the table below to calculate the average return over the years $2006-2010$ for ordinary shares and long$-$term government bonds. $(5)$

Table $1.$ Year on year total returns: $2006-2010$

$\backslash$table$[[$Year$,$Ordinary shares,$\backslash$table$[[$Long$-$term$],[$Government$],[$bonds$]],\backslash$table$[[$Money market$],[$index$]],\backslash$table$[[$Consumer$],[$price index$]]],[2006,40,9,5,6,7,9,5,8],[2007,18,9,4,3,10,0,9,0],[2008,-23,4,17,5,12,4,9,5],[2009,33,5,-1,0,9,1,6,3],[2010,18,7,15,3,6,9,3,5]]$

Calculate the standard deviations using information from problem $1.$ Which of the investments was the most volatile over the period? $(10)$