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sum ( (1/(25*(2*pi)^0.5))* (0.75*1.5+0.25*0.6)*(x-100)* e^-(((x-120)^2)/(2*25^2)) ) from 100 to 240
sum ( (1/(25*(2*pi)^0.5))* (0.75*1.5+0.25*0.6)*(x-100)* e^-(((x-120)^2)/(2*25^2)) ) from 100 to 240
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