Question

if 8 is the mean of 4 7 a 8 10 12 find a​

Answer 1

Explanation:

$Mean \:of \: given\:observations=\frac{Sum\: of \:observations}{Number\:of\:observations}$

Given,

$8=\frac{4+7+a+8+10+12}{6}$

==>  $8=\frac{41+a}{6}$

==> $41+a=8\times6$

==> $41+a=48$

==> $a=48-41$

∴ $a=7$

Answer: a = 7

I hope this helps. :D