What is the average value of $y = \sqrt { \cos x }$ on the interval $0 \leq x \leq \frac { \pi } { 2 }$ ? (A) - 0.637 (B) 0.500 (C) 0.763 (D) 1.198 (E) 1.882
What is the average value of $y = \sqrt { \cos x }$ on the interval $0 \leq x \leq \frac { \pi } { 2 }$ ?
(A) - 0.637
(B) 0.500
(C) 0.763
(D) 1.198
(E) 1.882