$P(通過英檢具備碩士學位|通過英檢)=\frac{P(通過英檢\cap具備碩士學位)}{P(通過英檢)}= \frac{\frac{3}{4} \times \frac{3}{5}}{\frac{3}{4}\times \frac{3}{5}+ \frac{1}{4}\times \frac{1}{5}}=$
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Ans:$\frac{9}{10}$
$P(通過英檢具備碩士學位|通過英檢)=\frac{P(通過英檢\cap具備碩士學位)}{P(通過英檢)}= \frac{\frac{3}{4} \times \frac{3}{5}}{\frac{3}{4}\times \frac{3}{5}+ \frac{1}{4}\times \frac{1}{5}}=$