Selected Formulas

Chapter 2

Relative Frequency=( frequency )/n

x ¯ = Σx n

s 2 = Σ ( x x ¯ ) 2 n1 = Σ x 2 ( Σx ) 2 n n1

s= s 2

z= xμ σ = x x ¯ s

Chebyshev=At least( 1 1 k 2 )100%

IQR= Q U Q L

Chapter 3

P( A c )=1P( A )

P( AB ) = P( A )+P( B )P( AB ) = P( A )+P( B )if AandBmutuallyexclusive

P( AB ) = P( A|B )P( B )=P( B|A )P( A ) = P( A )P( B )if AandBindependent

P( A|B )= P( AB ) P( B )

( N n )= N! n!( Nn )!

Chapter 4

Key Formulas

Random Variable Prob. Dist’n Mean Variance
General Discrete: Table, formula, or graph for ...

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