Q: What is mean of 12 15 21?

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min= 12 max=21 median=17 mode=17 mean=191

Sum = 85 Number = 5 So mean = 85/5 = 17

18

(21+15+19+28+10+17+9+15+26+14+10+18+24+12+16) / 15 = 16.93 recurring (that is, 16.93333...)

18/21 x 15 is 12 6/7

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min= 12 max=21 median=17 mode=17 mean=191

35

Sum = 85 Number = 5 So mean = 85/5 = 17

18

(21+15+19+28+10+17+9+15+26+14+10+18+24+12+16) / 15 = 16.93 recurring (that is, 16.93333...)

13 + 21 - 7 + 12 = 15

The Least Common Multiple (LCM) for 21 15 12 29 is 12,180.

It is: 420

18/21 x 15 is 12 6/7

-12 + 18 - (-15) = -12 + 18 +15 = 21

If you mean 15/21 then lowest terms is 5/7

15