The distribution of weights (rounded to the nearest whole number) of all boxes of a certain cereal is approximately normal with mean 25 ounces and standard deviation 2.5 ounces. A sample of the cereal boxes was selected, and the weights of the selected boxes are summarized in the histogram shown. Which of these values is the best estimate of the number of boxes in the sample with weights that are more than 2 standard deviations above the mean?