"\\mu=\\sum x* P(x)=-10*0.5+1*0.25+3*0.15+10*0.09+20*0.01=-3.2"
σ² = (0.5×(-10--3.2)²+0.25×(1--3.2)²+0.15×(3--3.2)²+0.09×(10--3.2)²+0.01×(20--3.2)²) / (0.5+0.25+0.15+0.09+0.01) = 54.36
σ="\\sqrt{\u03c3^2}=7.37"
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