Answer
$\frac{113}{174}$
Work Step by Step
We know that $probability=\frac{\text{number of favourable outcomes}}{\text{number of all outcomes}}$
The total population (the number of all outcomes) is $174$
By using the table, the total number of people who took 4 years of high school only, here is $82+31=113$
Hence the probability here is: $\frac{113}{174}$
