Question

Find the variance and the standard deviation of the following set,(5,6,7,8,9)

Answer 1

To find the variance, and standard deviation, calculate first for the mean.

$\begin{gathered} \mu=\frac{\sum x_i}{n} \\ \mu=\frac{5+6+7+8+9}{5} \\ \mu=\frac{35}{5} \\ \mu=7 \end{gathered}$

Now that we have the mean, we can now solve for the variance.

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