need help with questions 7 and 8

CHE DI MIG Probability Economy Return Recession 0.15 -10% Below Average 0.20 5% Average 0.30 8% Above Average 0.25 12% Boom 0.10 18% Stock W's expected returns is 67.00 QUESTION 7 Stock W's variance is approximately to 5 decimal places [X.XXXXX] QUESTION 8 Stock W's standard deviation of returns is approximately [as a %]