A Random Variable X Has a Cumulative Distribution Function F(x) $\frac { 1 } { x ^ { 2 } }$

Multiple Choice

A random variable X has a cumulative distribution function F(x) = 1 - $\frac { 1 } { x ^ { 2 } }$ (x≥1) . Find Pr(a ≤ X ≤ 5) .

A) 1 - $\frac { 1 } { a ^ { 2 } }$
B) $\frac { 24 } { 25 }$ - $\frac { 1 } { a ^ { 2 } }$
C) $\frac { 1 } { a ^ { 2 } }$ - $\frac { 1 } { 25 }$
D) $\frac { 1 } { a ^ { 2 } }$
E) none of these