Fabrikk A (60%60\%60%, 2%2\%2% defekt), B (40%40\%40%, 5%5\%5% defekt). Finn P(def)P(\text{def})P(def) og P(A∣def)P(A\mid\text{def})P(A∣def).
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$P(def)=0,6⋅0,02+0,4⋅0,05=0,012+0,020=0,032.P(\text{def})=0{,}6\cdot0{,}02+0{,}4\cdot0{,}05=0{,}012+0{,}020=0{,}032.P(def)=0,6⋅0,02+0,4⋅0,05=0,012+0,020=0,032.P(A∣def)=0,0120,032=0,375.\displaystyle P(A\mid\text{def})=\frac{0{,}012}{0{,}032}=0{,}375.P(A∣def)=0,0320,012=0,375.$
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