Answer
$P(F)=0.30$
Work Step by Step
$P(E)=0.60$, $P(E or F)=0.85$ and $P(E and F)=0.05$
$P(E or F)=P(E)+P(F)-P(E and F)$
$0.85=0.60+P(F)-0.05$
$0.85-0.60+0.05=P(F)$
$P(F)=0.30$
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