Given set of scores= 313, 252, 161, 727, 515, 818

We know the formula,

 $\mathrm{Average} \left(\mathrm{A}\right)=\frac{\mathrm{Sum} \mathrm{of} \mathrm{given} \mathrm{values} \left(\mathrm{S}\right)}{\mathrm{Total} \mathrm{number} \mathrm{of} \mathrm{values} \left(\mathrm{N}\right)}$

 Here,

 Sum of given values(S)

=313+252+161+727+515+818

= 1393

Total number of values(N)= 6

Substituting these values we get (A),

 $= \frac{1393}{6}=464.3$

Hence, Option A is correct.