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10 cards from this deck
Values cluster close to the mean.
Use (x - mean) for each data point.
SD = √(1/n * Σ(x - mean)²)
Calculate the mean of the data set.
Square each individual deviation from the mean.
Use SD = √(Σx²/n - (mean)²)
Forget to take the square root at the end.
It should be positive and reasonable.
Values are widely dispersed from the mean.
Examiners want to see each calculation step.
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