Problem $6-19($Algo$)$

Required:

A project has a $0\mathrm{.}90$ chance of doubling your investment in a year and a $0\mathrm{.}10$ chance of halving your investment in a year. What is the standard deviation of the rate of return on this investment? $($Do not round intermediate calculations. Round your answer to $2$ decimal places.$)$

Standard deviation

$\%$