Let $S$ be the set of all values of $a_{1}$ for which the mean deviation about the mean of 100 consecutive positive integers $a_{1}, a_{2}, a_{3}, \ldots, a_{100}$ is 25. Then $S$ is (1) $\phi$ (2) $\{99\}$ (3) $\mathbb{N}$ (4) $\{9\}$
Let $S$ be the set of all values of $a_{1}$ for which the mean deviation about the mean of 100 consecutive positive integers $a_{1}, a_{2}, a_{3}, \ldots, a_{100}$ is 25. Then $S$ is\\
(1) $\phi$\\
(2) $\{99\}$\\
(3) $\mathbb{N}$\\
(4) $\{9\}$