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FormulasR(q )=q⋅D(q )P(q )=R(q )−C(q )MP(q )=MR(q )−MC (q )∫0q0D(q )dq−q0¿ D(q0)f'( x )≃f ( x+h)−f ( x−h)2⋅hΔx=b−anxi=a+i⋅Δxmi=xi−1+xi2Sn(f ,[ a ,b ])=∑i=1nf (mi)⋅ΔxfX( x)={0 if x<a1b−aif a≤x≤b0 if x>bFX( x )={0 if x<ax−ab−aif a≤x≤b1 if x>bfX( x)={0 if x<01α⋅e−x / αif x≥ 0FX( x )={0 if x<01−e−x /αif x≥0fZ( z )=1√2⋅π⋅e−0. 5⋅z2fX( x )=1σX⋅√2⋅π⋅e−0 .5⋅(x−μXσX)2E( X )=∑all xx⋅fX( x )E( X )=n⋅pE( X )=∫−∞∞x⋅fX( x )dxE( X )=a+b2E( X )=α ¯x=1n⋅∑i=1nxi V ( X )=∑all x(x−μX)2⋅fX( x )V ( X )=n⋅p⋅(1− p )V ( X )=∫−∞∞(x−μX)2⋅fX( x )dx V ( X )=(b−a )212V ( X )=α2σ2=V ( X )V (¯x )=V ( X )ns2=1n−1⋅∑i=1n(xi−¯x)2S=X


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UA MATH 115A - Study Notes

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