The average heights of 1st grade students at a school is 45 inches with a standard deviation of 2 inches, while the average heights of the 4th graders at the school is 55 inches with a standard deviation of 4 inches. Two brothers attend the school. The older brother, in 4th grade, is 58 inches tall. The younger brother, in 1st grade, is 48 inches tall. Which brother is taller relative to the other kids in his class