6. The random variable \(X\) has a normal distribution with mean 30 and standard deviation 5 .
- Find \(\mathrm { P } ( X < 39 )\).
- Find the value of \(d\) such that \(\mathrm { P } ( X < d ) = 0.1151\)
- Find the value of \(e\) such that \(\mathrm { P } ( X > e ) = 0.1151\)
- Find \(\mathrm { P } ( d < X < e )\).