15.8 how to get it: 12 + 14 + 15 + 19 +19 =79 then count how many numbers there are and divide it by the sum. so in this case 79 divided by 5 =15.8
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(21+15+19+28+10+17+9+15+26+14+10+18+24+12+16) / 15 = 16.93 recurring (that is, 16.93333...)
17
(15 + 19)/2 = 17
They are: 12, 14, 15, 16 and 18
min= 12 max=21 median=17 mode=17 mean=191