AHSME 1969 Problem 9

The arithmetic mean (ordinary average) of the fifty-two successive positive integers beginning at 2 is: $\text{(A) } 27 \text{(B) } 27\tfrac{1}{4} \text{(C) } 27\tfrac{1}{2} \text{(D) } 28 \text{(E) } 27\tfrac{1}{2}$