Using Fluorescent Imaging Techniques, Researchers Observed That the Position of Binding

Multiple Choice

Using fluorescent imaging techniques, researchers observed that the position of binding sites on HIV peptides is approximately Normally distributed with a mean of 2.45 microns and a standard deviation of 0.35 micron.
What position (in microns) are 20% of binding sites greater than?

A) 2.0 microns
B) 2.16 microns
C) 2.74 microns
D) 2.9 microns