Please, show the calculation and if possible how to do it on Excel

Question 1 Calculate the expected return and standard deviation for this asset using the forecasted scenarios below: Scenario 1 Scenario2 Scenario 3 Scenario 4 Probability 5% 30% 50% 15% of scenario Return -15% -3% 7% 20% forecast Expected return: 9%; Standard deviation: 14.09% Expected return: 4.85%; Standard deviation: 3.6% Expected return: 4.85%; Standard deviation: 8.66% Expected return: 0.0485; Standard deviation: 0.0036