A firm you are analyzing has had the following returns the past $5$ years: $27\mathrm{.}0\%,13\mathrm{.}0\%,18\mathrm{.}0\%,-14\mathrm{.}0\%$ and $10\mathrm{.}0\%.$ What are the standard deviation and variance of the past five year returns? Please show all steps.