# find summation of data set when mean and standard deviation are given [closed]

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 $\sqrt{23.75}$

## closed as off-topic by Shailesh, Vlad, GNUSupporter 8964民主女神 地下教會, Namaste, ncmathsadistApr 17 '18 at 13:34

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• What are your own thoughts? Hint: It's important to know how the mean is calculated. – Matti P. Apr 17 '18 at 11:25

The mean is the sum divided by the number of point, $8$ in this case. Therefore, the sum of the points is $8\times 9.5$.