If the mean and standard deviation of $n$ observations $x_1, x_2, \dots, x_n$ are $\bar{x}$ and $\sigma$ respectively,then what is the sum of the squares of the observations?
- A$n(\sigma^2 + \bar{x}^2)$
- B$n(\sigma^2 - \bar{x}^2)$
- C$n(\bar{x}^2 - \sigma^2)$
- DNone of these
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View SolutionIf the variance of the numbers $2, 3, 11$ and $x$ is $\frac{49}{4}$,then the values of $x$ are
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