To find the probability of Player A making a successful free throw based on their previous performance, we can use the formula for probability:
\[ P(\text{success}) = \frac{\text{number of successful throws}}{\text{total attempts}} \]
In this case, Player A has made 80 successful free throws out of 300 attempts. Therefore, the probability of a successful throw is:
\[ P(\text{success}) = \frac{80}{300} \]
Next, we simplify the fraction \(\frac{80}{300}\):
- Find the greatest common divisor (GCD) of 80 and 300, which is 20.
- Divide both the numerator and the denominator by their GCD:
\[ \frac{80 \div 20}{300 \div 20} = \frac{4}{15} \]
So, the probability of Player A successfully making another free throw is:
\[ \frac{4}{15} \]
Thus, the answer is:
\(\frac{4}{15}\)