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13 cards from this deck
Spread of data around the mean
s=∑f(x−xˉ)2∑fs = \sqrt{\frac{\sum f(x - \bar{x})^2}{\sum f}}s=∑f∑f(x−xˉ)2
Midpoint of each class interval
Mean of the distribution
Frequency of each class
Total frequency
xˉ=∑(f×x)∑f\bar{x} = \frac{\sum (f \times x)}{\sum f}xˉ=∑f∑(f×x)
Calculate the mean xˉ\bar{x}xˉ
Find deviations (x−xˉ)(x - \bar{x})(x−xˉ)
Square the deviations (x−xˉ)2(x - \bar{x})^2(x−xˉ)2
Multiply squared deviations by frequency fff
Sum all f(x−xˉ)2f(x - \bar{x})^2f(x−xˉ)2 values
Divide by ∑f\sum f∑f and take square root
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