Question 1154596
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<pre>

In accordance with the definition of the <U>conditional probability</U>,


    P(f|e) = P(e and f) / P(e).


Substitute the given values into the formula and get


    P(f|e) = {{{0.2/0.5}}} = 0.4.     <U>ANSWER</U>
</pre>

Solved.


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On conditional probability, &nbsp;see the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/Probability-and-statistics/Conditional-probability-problems.lesson>Conditional probability problems</A> 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/Probability-and-statistics/More-conditional-probability-problems.lesson>More conditional probability problems</A> 

in this site.