no clue how tall T-Mac was, but 9th graders ar generally 14-15 yrs old. When i was in high school, the avg. hiegth of a 9th grader was about 5'10" or so, with the tallest being 6 feet (me and 3 others) and the shortest being right at 5 feet tall. At the school I teach at now, it's a little less than that, I think, but we have a lot of hispanics that bring down the average.
Sorry, you'll have to do the metric conversions, I'm to lazy.