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    IBEasyStatistics7–9

    Completing a Two-Way Table

    Completar uma Tabela de Dupla Entrada

    A survey of 80 students records two things: whether a student walks to school, and whether a student takes the school lunch. Of the students surveyed, 48 walk to school, 30 of those who walk also take the school lunch, and 45 students in total take the school lunch. How many of the 80 students neither walk to school nor take the school lunch?

    Every student sits in exactly one of the four cells, and each row total and each column total must reach the totals given. Start from a cell you can reach by subtracting one number from a total you already know.

    Solution

    Step 1 of 7

    1. 1.Students who do not walk: