Back to Construct and interpret two-way frequency tables — Problem 1 · Task Set 21

Exercises: Construct and Interpret Two-Way Frequency Tables

Work through each section in order. Read each two-way table carefully and decide which total is the correct denominator BEFORE computing: the grand total for marginal and joint probabilities, but a single row or column total for a conditional probability. Write probabilities as fractions or decimals, and remember that probabilities read from sample data are ESTIMATES, not exact values.

Grade 10·21 problems·~35 min·Common Core Math - HS Statistics and Probability·group·hss-cp-a-4

Work through problems with immediate feedback

Warm-Up: Reading a Two-Way Table

These problems review reading totals and relative frequencies from a table.

A survey classifies 120 students by grade and favorite subject.

	Math	Science	English	Total
10th grade	18	24	18	60
11th grade	22	16	22	60
Total	40	40	40	120

In this table, what does the number 24 represent?

The count of students who are in tenth grade AND favor science (a joint cell).

The total number of students who favor science.

The total number of tenth graders.

The probability that a student favors science.