A Set of Supposedly Identical Solutions of the Dye Rhodamine

A set of supposedly identical solutions of the dye rhodamine 6G were prepared. The concentrations of the solutions were determined using spectrophotometry and were found to be normally distributed with a mean concentration of 12.672 mmol dm^-3 and a standard deviation of 0.012 mmol dm^-3. What proportion of the samples would be expected to have concentrations greater than 12.696 mmol dm^-3?

A) 2.5%
B) 5.0%
C) 16.0%
D) 32.0%