Step 1: The probability of an event is given by the formula:
\[
P(\text{event}) = \frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}}
\]
Step 2: Here, the number of favorable outcomes is the frequency of 5, which is 150. The total number of outcomes is 1000.
\[
P(\text{5}) = \frac{150}{1000} = \frac{3}{20}
\]
Thus, the probability that the die shows 5 is \(\frac{3}{20}\).