The graph shows the probability density function \(\mathrm { f } ( x )\) of the continuous random variable \(X\)
\includegraphics[max width=\textwidth, alt={}, center]{128c408d-3e08-4f74-8f19-d33ecd5c882f-04_951_1365_322_331}
Find \(\mathrm { P } ( X < 4 )\)
Specify the cumulative distribution function of \(X\) for \(7 \leqslant x \leqslant 11\)