Question 1142523
<br>
a) From the basic definition of probability,<br><pre>
      number of females
  --------------------------
  total number in the sample<br></pre>
b) From the same definition,<br><pre>
   number of females who smoke
  -----------------------------
   total number in the sample<br></pre>
c) With the condition "given that he is a male", the denominator of the probability fraction is only the number of males in the sample:<br><pre>
    number of males who smoke
   ---------------------------
     total number of males<br></pre>