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Formulae to Remember ­ Statistics S1

x f x
Mean = x = n or f


(x2) x 2 (x2)
Variance = =2
n - ( n ) or n - (x)2

Standard Deviation = = V ariance

Interquartile Range (IQR) = Q3 - Q1

P(A') = 1 ­ P(A)…

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Area Frequency

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