Answer: 3.96%
Explanation:
The Arithmetic Mean is a most famous Quantitative Analysis method that simply involves adding up all figures involved and dividing it by the number of figures involved.
Calculating it therefore would be,
= -9.7 + -8.1 + 15 + 7.2 + 15.4 /5
= 19.8/5
= 3.96 %
There seems to be an error in the multiple choice.
3.96 % is the arithmetic average return of Roddy Richard's investment based on the information we have but it is not listed.