The fraction \( \frac{16}{30} \) represents the frequency or relative frequency of rolling an even number when Sarah rolled the number cubes 30 times. In this case, it indicates that Sarah rolled an even number 16 times out of 30 total rolls.
To express this as a probability, you can simplify the fraction:
\[ \frac{16}{30} = \frac{8}{15} \]
Thus, \( \frac{8}{15} \) represents the empirical probability of rolling an even number based on Sarah's experiment. This means that, based on her results, the probability of rolling an even number is approximately 0.533 or 53.3%.