Question

If the Arthemetic mean of marks 3,4,8,5, X,3,2,1 is 4 find the value of x​

Answer 1

$\mathtt \red {Mean = \frac{ x_1 + x_{2} + x_{3} + x_{4}..... x_{n} }{no. \: of \: terms} }$

$\mathtt{Mean = \frac{3 + 4 + 8 + 5 + x + 3 + 2 + 1}{8} } = 4 \\ \\ = \frac{26 + x}{8} = 4 \\ \\ 26 + x = 32 \\ \\ \fbox \red{\boxed{x = 6}}$

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