The return on the Super Traders share portfolio over the past six years are reported as follows:

Year $/$ Return$2018-11\mathrm{.}5\%2019-5\mathrm{.}2\%2020-(-1\mathrm{.}5\%)2021-16\mathrm{.}5\%2022-42\mathrm{.}5\%2023-13\mathrm{.}3\%$A$)$ calculate the average return of the portfolio over the six years. calculate the variance and the standard deviation on the portfolio $(12$ marks$)$C$)$ explain the significance of the standard deviation. $(3$ marks$)$