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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, ncmathsadist Apr 17 '18 at 13:34

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  • "This question is missing context or other details: Please improve the question by providing additional context, which ideally includes your thoughts on the problem and any attempts you have made to solve it. This information helps others identify where you have difficulties and helps them write answers appropriate to your experience level." – Shailesh, Vlad, GNUSupporter 8964民主女神 地下教會, Namaste, ncmathsadist
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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

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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