Question

a cafeteria kept track of the type of milk students chose at lunch today.
complete the two - way table to display the relative frequencies by row.

Explanation:

Step1: Calculate the total number of 8th - grade students

The number of 8th - grade students who chose plain milk is \(28\), and the number of 8th - grade students who chose chocolate milk is \(22\). So the total number of 8th - grade students is \(28 + 22=50\).

Step2: Calculate the relative frequency of 8th - grade students who chose plain milk

The formula for relative frequency (by row) is \(\text{Relative Frequency}=\frac{\text{Number of students in a category}}{\text{Total number of students in the row}}\times100\%\).
For plain milk in 8th - grade: \(\frac{28}{50}\times100\% = 56\%\)

Step3: Calculate the relative frequency of 8th - grade students who chose chocolate milk

For chocolate milk in 8th - grade: \(\frac{22}{50}\times100\%=44\%\)

Answer:

The relative frequency of 8th - grade students who chose plain milk is \(56\%\), and the relative frequency of 8th - grade students who chose chocolate milk is \(44\%\).