Symmetrical Properties Of Normal Distribution Q4

It is given that \(X\)~\(N(\mu ,\sigma^{2})\) and \( \mathrm{P}(X<4)=\mathrm{P}(X>8)\). It’s also given that \(5 \mathrm{P}(X<3)= \mathrm{P}(X<9)\). Find \(\mu\) and \(\sigma\).