Find the Function Value $f ( x ) = \left( \frac { 1 } { 3 } \right) ^ { x }$

Multiple Choice

Find the function value. If the result is irrational, round your answer to the nearest thousandth.
-Let $f ( x ) = \left( \frac { 1 } { 3 } \right) ^ { x }$ . Find $\left( \frac { 5 } { 2 } \right)$ .

A) $\frac { 5 } { 6 }$
B) $15.588$
C) $1.357$
D) $0.064$