If a dataset has nnn values, the mean is xˉ\bar{x}xˉ, and the variance is σ2\sigma^2σ2, what is ∑xi2\sum x_i^2∑xi2?
n(σ2+xˉ2)n(\sigma^2 + \bar{x}^2)n(σ2+xˉ2)
nσ2+xˉ2n\sigma^2 + \bar{x}^2nσ2+xˉ2
n(σ2−xˉ2)n(\sigma^2 - \bar{x}^2)n(σ2−xˉ2)
σ2+nxˉ2\sigma^2 + n\bar{x}^2σ2+nxˉ2