8+9+12+18+23/5=14
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(23 - 18) × 8 - 16 = 24
1.2778
(8 × 12) − 23 = 73
18, 23, 10, 39, 22, 17, 16, 15 Mean = (18 + 23 + 10 + 39 + 22 + 17 + 16 + 15)/8 = 20 Lowest Number in set is 10 Highest Number in set is 39 Range = (39 - 10) = 29
25