I have the answer to the question, but I need hep understanding how a portion of the problem works. The answer is 454.45%, but I need help understanding how the variance's VAR 544.7 in yellow how it was calculated step by step please

Stock Fund Rate of Return Rate of Return Bond Fund Scenario Probability 0.10 Severe recession Mild recession Normal growth Boom -37% -11% 14% 30% -9% 15% 8% -5% 0.35 0.35 Calculate the values of mean return and variance for the stock fund. Mean Return 9.50% Variance 454.45% E(Stock)-9.5% Var-544.7-(9.5)^2=454.45