Find the Value of σ If It Is Know That

Short Answer

Find the value of σ if it is know that X is normally distributed with mean 5 and 14.92% of the values are above 8? $\begin{array}{|l|l|}\hline \text { A. } & 2.14 \\\hline \text { B. } & 2.88 \\\hline \text { C. } & 3 \\\hline \text { D. } & \text { None of these choices are correct. } \\\hline\end{array}$