Find the arithmetic mean of $-3$ and $21$

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Odinaka_OTyro

Asked: December 25, 20202020-12-25T21:00:38+00:00 2020-12-25T21:00:38+00:00In: Arithmetic, Numbers and Combinatorics

Find the arithmetic mean of $-3$ and $21$

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Find the arithmetic mean of $-3$ and $21$

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Sengemegz · Accepted Answer · 2020-12-29T19:51:31+00:00

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Sengemegz Moderator

2020-12-29T19:51:31+00:00Added an answer on December 29, 2020 at 7:51 pm

Arithmetic mean $(b)=\dfrac{1}{2}(a+c)$
Where $a=-3$ and $c=21$
Hence
$\Rightarrow b=\dfrac{1}{2}(-3+21)$
$\Rightarrow b=\dfrac{1}{2}(18)$
$\therefore b=9$

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