The result of rolling a fair die 150 times is as summarized in the table given.\(\begin{array}{c|c} Number & 1 & 2 & 3 & 4 & 5 & 6 \\ \hline Frequency & 12 & 18 & x & 30 & 2x & 45\end{array}\)
What is the probability of obtaining a 5?

• A.\(\frac{3}{10}\)
• B.\(\frac{1}{5}\)
• C.\(\frac{1}{6}\)
• D.\(\frac{1}{10}\)
• E.