Back to Construct and interpret two-way frequency tables — Problem 3 · 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
Warm-Up: Reading a Two-Way Table
These problems review reading totals and relative frequencies from a table.
1.
Use the same table.
| Math | Science | English | Total | |
|---|---|---|---|---|
| 10th grade | 18 | 24 | 18 | 60 |
| 11th grade | 22 | 16 | 22 | 60 |
| Total | 40 | 40 | 40 | 120 |
What fraction of ALL 120 students favor math? Give your answer as a fraction in lowest terms.