Answer
$\frac{3}{10}$
Work Step by Step
To calculate probability, we need to divide the number of chances for a certain outcome to occur by the total number of outcomes. In this case, there are $9$ science teachers, and 30 teachers in total. When we divide 9 by 30, we get $\frac{3}{10}$, which is the probability of choosing a science teacher, or $P(\text{science})$.
