Can this please be calculated with full excel woking out?- i posted earlier but i need a lot more help of how to calculate the standard deviation via excel- ive used "=stdv" but the previous answer given to me on chegg was 14.22% but i cant reach that answer through my own working out

Calculate the standard deviation of returns of ABC Ltd, using the below forecast data as of 2023. Prob. Return (%) 0.25 "-8" 0.50 15 0.25 32