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Sharethefun · Answer 1 · 2017-04-05T07:28:56+0000

arithmetic mean of 7 , 21
(7 + 21) /2 = 14

Arithmetic mean of 7 and 14
(7+ 14) /2 = 10.5

Arithmetic mean of 14 and 21
(21 + 14)/2 =17.5

so, the three arithmetic means would be : 10.5 , 14 , and 17.5

hope this helps

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