Find the Average of the Function $f ( x ) = e ^ { x }$

Multiple Choice

Find the average of the function $f ( x ) = e ^ { x }$ over $[ 0,8 ]$ .

A) Average = $1 - e ^ { 8 }$
B) Average = $\frac { e ^ { - 8 } } { 8 }$
C) Average = $\frac { 1 + e ^ { - 8 } } { 8 }$
D) Average = $\frac { e ^ { 8 } - 1 } { 8 }$
E) Average = $1 - e ^ { - 8 }$