for mean height, to nearest inch

83 ft + 88 ft + 97 ft + 10 in + 6 in + 3 in  = 268 ft + 19 in = 268 ft + 1 ft + 7 in = 269 ft 7 in  = 3235 inches

3235 in / 3 = 1078.33 in= 89.861 ft = 89 ft 10.33 inches   or   89 ft 10 inches (rounded)