If both the mean and the standard deviation of \(50\) observations \(x_{1}, x_{2}, \ldots, x_{50}\) are equal to \(16\), then the mean of \(\left( x_{1} - 4 \right)^{2}, \left( x_{2} - 4 \right)^{2}, \ldots, \left( x_{50} - 4 \right)^{2}\) is:
1
\(525\)
2
\(380\)
3
\(480\)
4
\(400\)