Calculate for the z-score of the given value through the equation,
z-score = (x - m) / s
Where x is the data, m is the mean, and s is the standard deviation. Substituting the known values,
z-score = (76.7 - 75) / 0.5
z-score = 3.4
Converting this to percentage will give us 99.87%. The percentage not covered in this is 0.13%.
ANSWER: 0.13%