Answer
$P(left)=\frac{17}{35}\approx0.4857$
Work Step by Step
The sample space: $70$ home runs. So, $N(S)=70$
$N(left)=34$
Using the Classical Method (page 259):
$P(left)=\frac{N(left)}{N(S)}=\frac{34}{70}=\frac{17}{35}\approx0.4857$
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