Find the Average Value of the Function Over the Given $f ( x ) = 7 \sqrt [ 3 ] { x }$

Multiple Choice

Find the average value of the function over the given interval. $f ( x ) = 7 \sqrt [ 3 ] { x }$ on [0,8]

A) $\frac { 7 } { 4 }$
B) $\frac { 14 } { 9 }$
C) $\frac { 21 } { 2 }$
D) $\frac { 8 } { 3 }$
E) $\frac { 64 } { 3 }$