i need help with this asap in 30 minutesd or less

mean return 2%, standard deviation 4% => annualized expected return 27%,annualized volatility 14%, which is almost 2 standard deviations away from negative return(equivalent to a sharpe ratio of 2)

assume 4 independent strategies, annualized mean return 27%, annualized std 27% =>2 stds away from negative return?

can somebody proof read this/provide the calculation behind this?