Problem preview
S-CP.4 Warmup M2-066-A04-V01

Construct and interpret two-way frequency tables as sample spaces for independence and conditional probability.

Find a marginal probability from a two-way frequency table

Problem

From the table, compute the row's marginal probability by dividing its total \(40\) by the grand total \(100\) and reducing.

Big Picture

What this problem is really about

A marginal probability starts at a row or column edge total and compares it with the grand total. We’ll locate the requested margin, place it over the entire sample, reduce without inverting the ratio, and translate the fraction into the share of all observations in that category.

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Four variants of this problem type
Curriculum context
Course
Math II
Standard
S-CP.4
Category
Statistics and Probability
Domain
Conditional Probability and the Rules of Probability
Objective
Construct and interpret two-way frequency tables as sample spaces for independence and conditional probability.
Problem type
Find a marginal probability from a two-way frequency table