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Weight each value by its frequency in calculations.
Formula 1: Σf(x−x̄)²/Σf; Formula 2: √(Σfx²/Σf - (Σfx/Σf)²)
x̄ = Σfx / Σf, sum of fx divided by total frequency.
Subtract the mean from each x-value in the table.
Large SD indicates more data spread from the mean.
SD increases as data spread out more from the mean.
σ = √(24/25) = √0.96 = 0.98 goals
SD=√(105/25−(45/25)²)=√0.96=0.98
x̄ = Σfx/Σf = 45/25 = 1.8
σ = √(24/25) = √0.96 = 0.98
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