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question is here

The mean and standard deviation of a series of data points $(X_1 , X_2, X_3, X_4, X_5, X_6, X_7, X_8)$ are $9.5$ and $\sqrt{23.75}$

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  • $\begingroup$ What are your own thoughts? Hint: It's important to know how the mean is calculated. $\endgroup$ – Matti P. Apr 17 '18 at 11:25
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The mean is the sum divided by the number of point, $8$ in this case. Therefore, the sum of the points is $8\times 9.5$.

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