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Standard deviation = √(Σf(x - x̄)² / Σf)
Mean (x̄) = Σfx / Σf
Σf is the total frequency, the sum of all frequencies.
Mean = 45 / 25 = 1.8 goals.
Standard deviation = √(Σfx²/Σf - (Σfx/Σf)²)
It measures the spread or variability of data values.
Forgetting to multiply by frequency for each value.
Subtract the mean from each data value.
Rounding can distort data trends and conclusions.
Apply it after summing squared values in formulas.
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