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
A
Fluency Practice
Compute each probability from the given table. Choose the correct denominator before you compute.
1.
A pet survey records, for 50 people, whether they own a dog and whether they own a cat. Two cells are missing.
| Owns Cat | No Cat | Total | |
|---|---|---|---|
| Owns Dog | 12 | 13 | ? |
| No Dog | 8 | 17 | 25 |
| Total | 20 | ? | 50 |
What is the Owns Dog row total (the cell marked "?" in that row)?