Suppose a population \(A\) has 100 observations 101, 102, ..., 200 and another population \(B\) has 100 observations 151, 152, ..., 250. If \(V_A\) and \(V_B\) represent the variances of the two populations, respectively, then \(V_A/V_B\) is equal to
$x_1,x_2,\ldots,x_n$ are observations with mean $\bar{x}$ and variance $\sigma^2$. If $u_i=\dfrac{x_i-\bar{x}}{\sigma}$, then the standard deviation of $u_1,u_2,\ldots,u_n$ is