GM = (125 × 130 × 75 × 45 × 10) 1/5 log GM = (1/5) [ log 125 + log 130 + log 75 + log 45 + log 10] log GM = (1/5) [ 2.0969 + 2.1139 + 1.8751 + 1.6532 + 1.0000] log GM = (1/5) [ 8.7391] log GM = 1.7478 GM = antilog 1.7478 = 55.95