Calculate the coefficient of variation of the risk return relationship during each decade. average return for bonds
1950-1959 2.3
1960 1960 4.1
1970-1079 6.0
1980-1089 8.4
1990-1099 4.8
2000-2009 2.6
Standard deviation
50-59 1.2
60-69 1.9
70-79 2.1
80-89 2.5
90-99 1.4
2000 -9 2.2