Glencoe Math: Course 3, Volume 2
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Glencoe Math: Course 3, Volume 2 View details
3. Two-Way Tables
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Exercise 3 Page 693

To find the relative frequencies by row, we calculate the ratios of each value and the total in that row.

Relative Frequencies:

Text Message Instant Message Total
7th graders
8th graders
Total

Example Solution: Many more graders text message than instant message. The graders split more evenly.

Practice makes perfect

We want to find relative frequencies by row. To do so, we will start by completing the given table.

Text Message Instant Message Total
7th graders
8th graders
Total
Let's find the sums of each row and column.
Let's write the newly obtained information in our table.
Text Message Instant Message Total
7th graders
8th graders
Total
We have two ways of calculating the grand total. We can add the number of to the number of or we can add the students who to the students who These two numbers must be the same!
Now, we can complete our table!
Text Message Instant Message Total
7th graders
8th graders
Total

To find the relative frequencies by row, we calculate the ratios of each value and the total in that row. We will round the results to the nearest hundredth.

Text Message Instant Message Total
7th graders
8th graders
Total

Looking at the relative frequencies, we can say that many more graders text message than instant message. The graders split more evenly.