5+7+9+12+12 = 45 and 45/5 = 9 which is the mean average
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9
=12*(9+5)/7 = 12*14/7 = 12*2 = 24
Average = (12 + 8 + 7)/3 = 27/3 = 9
The ratio of 5 and 7 8 and 9 12 and 18 85 and 170 is 5:7/8:9/12:18/85:170.
Sample size: 12 Sorted sample: 3, 5, 6, 6, 7, 7, 8, 9, 9, 9, 10, 10 Middle numbers: 7, 8 Average of middle numbers, known as median: 7.5