Usual values fall within 2 standard deviations of the mean.

Since the mean is 13.41 oz and the standard deviation is 0.12 oz, we can calculate the limits by adding/subtracting 2 standard deviations:

Lower: 13.41 - 2(0.12) = 13.41 - 0.24 = 13.17 oz

Upper: 13.41 + 2(0.12) = 13.41 + 0.24 = 13.65 oz

Since 13.49 falls within the range 13.17 through 13.65, it would not be unusual to have a can with 13.49 oz.