Question

the mean of 1, 7, 5, 3, 4 and X is 5 find x

Answer 1

Mean=Sum of observations/Total no. of observations
A.T.Q

(1+7+5+3+4+X)/6=5
X=30-20=10

Answer 2

$mean = \frac{sum \: of \: observation}{total \: number \: of \: observation} \\ = \frac{1 + 7 + 5 + 3 + 4 + x}{6} \\ = \frac{20 + x}{6} = 5 \\ = 20 + x = 5 \times 6 \\ = 20 + x = 30 \\ = x = 30 - 20 \\ = x = 10$
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