I added up all the numbers to get 126,
then i divided that all by 7 to get 18.
your final answer is 18.
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mean(18, 23, 39, 10, 22, 17, 16, 15) = (18 + 23 + 39 + 10 + 22 + 17 + 16 + 15) ÷ 8 = 160 ÷ 8 = 20
17
(21+15+19+28+10+17+9+15+26+14+10+18+24+12+16) / 15 = 16.93 recurring (that is, 16.93333...)
Since there are five numbers there,their mean is 1/5 of their sum.
Mean: 13.6 Median: 15 Mode: 16, 18, 15, 9, 10