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kjetil b halvorsen
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Your two ways does't make a difference, they give the same result. You can use algebra to check that $$ \frac{x_1+\dotsm+x_n+\bar{x}}{n+1}=\bar{x} $$ where $\bar{x}\frac{x_1+\dotsm+x_n}{n}$ is the mean.

kjetil b halvorsen
  • 82.8k
  • 32
  • 201
  • 663