Answer
$P(F~|~E)=0.525$
Work Step by Step
$P(E~and~F)=0.21$ and $P(E)=0.4$
Using the Conditional Probability Rule (see page 288):
$P(F~|~E)=\frac{P(E~and~F)}{P(E)}=\frac{0.21}{0.4}=0.525$
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