In this case, to calculate the probability, it would be to divide the number specifics 8 made (15 totals - 7 misses) by the numer of totals, ie 15. like this:
[tex]\begin{gathered} P=\frac{8}{15} \\ P\text{ = }0.533 \\ P\text{ = 53\%} \end{gathered}[/tex]therefore the answer is c. 53%