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0.2*(15%-9%)²+0.6*(10%-9%)²+0.2(0-9%)²
=0.2*(0.15-0.09)²+0.6*(0.1-0.09)²+0.2(0-0.09)²
=0.2*(0.06)²+0.6*(0.01)²+0.2(-0.09)²
=0.2*(0.0036)+0.6*(0.0001)+0.2(0.0081)
=0.00072+0.00006+0.00162
=0.00078+0.00162
=0.0024
=0.2*(0.15-0.09)²+0.6*(0.1-0.09)²+0.2(0-0.09)²
=0.2*(0.06)²+0.6*(0.01)²+0.2(-0.09)²
=0.2*(0.0036)+0.6*(0.0001)+0.2(0.0081)
=0.00072+0.00006+0.00162
=0.00078+0.00162
=0.0024
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