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Arithmetic Mean from Frequency Table

If the mean o...

Question

If the mean of number $26, 24, 36, 38, x, 29, 34$ is $31$ , then what is the value of $x$

A

30

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B

33

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C

31

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D

28

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Solution

The correct option is A $30$
$\begin{matrix} \Rightarrow \frac{26 + 24 + 36 + 38 + x + 29 + 34}{7} = 31 \Rightarrow x + 187 = 217 x = 30 \end{matrix}$

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