the average height of an 8 year old boy is four ft. two
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The average height of a 9-year-old boy is 49 inches, and the average height of a 10-year-old boy is 51 inches. One can estimate that the average height of a 3rd-grader, who is 9 at the beginning of the school year and 10 by graduation, is about 50 inches.
Well... most third-graders are 8 or 9... Their avrage height is probaly around four-foot-two.
3 ft 6 to 4 ft8 in however some kids have been reported as tall as 4 ft 3 to 4 ft 6 in
An average height of a 6th grade boy is about 5'0-5'4
The height depends, among other factors, on the ethnicity of the cohort.
The average height of a seven year old boy is about 48 inches.
The average or normal height of a ten year old girl who's in 5th grade is 4'5-4'8
usually from 5 1/2 feet to 6 feet or 170cm to 180 cm