1 expected value=10%*2000+40%*5000+50%6000=5200
2 variance=10%*(1000-5200)^2+40%*(5000-5200)^2+50%*(6000-5200)^2=2100000（^2是平方的意思）
stardard deviation=2100000开平方(数学符号打不出来)=1449
3 if the second project has the same expectation but smaller standard deviation then you should choose the second the project, the reason is that the expected profit of the second profect is the same as the first one but contains smaller risk
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