Key Formulas
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11.1 Statistical Analysis
 
11.2 Probability
 
11.3 Permutations and Combinations
 
11.4 Group Questions
 
 
11.5 Sets
 
11.6 Key Formulas
 
11.7 Review Questions
 
11.8 Explanations
 
Key Formulas
Arithmetic Mean
Permutation
nPr = , where r is the size of the subgroup taken from a set with n elements.
Combination
= , or nPr /r!, where r is the size of the subgroup taken from a set with n elements.
Probability
Total Elements of Overlapping Sets
If two subsets of a set share elements, the equation that governs the total number of elements in the set is:
Total Elements = Group A Elements + Group B Elements + Neither Group A nor Group B Elements – Group A and Group B Elements
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