The number of girls that send letters weekly is 25.
Total number of classmates that send letters monthly is 30.
The number of boys that send letters yearly is 25.
The number of girls that never send letters is 30.
The number of boys that never send letters is 30.
Total number of boys is 80.
Definition of a two-way frequency table.
A two-way frequency table displays data from a single group of people into two categories. In this question, the two-way frequency table groups data on classmates into males and females.
Constructing the table
- The number of females that send letters weekly = 40 - 15 = 25.
- Total number of classmates that send letters monthly = 20 + 10 = 30
- The number of males that send letters yearly = 40 - 15 = 25.
- The number of females that never send letters = 90 - (25 + 20 + 15) = 30
- The number of males that never send letters =60 - 30 = 30
- Total number of boys = 170 - 90 = 80
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