Explanation

Given height of six students= 304, 208, 162, 110, 154, 316, 242, 216

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)

=304+208+162+110+154+316+242+216

= 1712

Total number of values(N)= 8

Substituting these values we get (A),

 $= \frac{1712}{8}=214$

Hence, Option C is correct.