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MathMentor

Learn with Mentor · 8 min

Find Probabilities Using Two-Way Frequency Tables

Read row totals, cell counts and conditional denominators from a two-way frequency table to write probabilities.

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Find the right denominator

A two-way frequency table sorts people or objects by two categories. Most mistakes come from choosing the wrong denominator, so first decide whether the question uses the whole table or only one row or column.