This graph compares shoe sizes for a group of 80 two-year-old boys and a group of 60 three-year-old boys. two box and whisker plots showing shoes sizes on a number line from 2.5 to 13. the upper plot represents the group of 2 year-old boys. for this upper plot, the minimum number is 3, the maximum number is 9.5, the right side of the box is 7.5, the left side of the box is 3.5, and the bar in the box is at 6. the lower plot represents the group of 3 year-old boys. for this lower plot, the minimum number is 5, the maximum number is 11.5, the right side of the box is 9.5, the left side of the box is 6.5, and the bar in the box is at 8. about how many more two-year-old boys have a shoe size of 6 or less, compared to the three-year-old boys?