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No. It is clear that Marge Orrine has no clue about the meaning of her formula, impressive as that formula seems.
The concept of standard deviation reflects the amount of variability in the data:
This is how Marge came up with a standard deviation of 3:
Step 1: Determining the mean of the data:
Step 2: Determine the sum of the squared deviations of the mean:
Step 3: Plug data into formula to calculate standard deviation.
Maybe Marge will read this quiz to improve her understanding of standard deviation.