Problem
Here are the numbers of children in 11 elementary school classes. \[ 17,17,18,19,16,17,19,17,18,18,18 \] Send data to calculator Find the modes of this data set. If there is more than one mode, write them separated by commas. If there is no mode, click on "No mode."
Solution
Step 1 ：Count frequencies of each number
Step 2 ：Find numbers with highest frequency
Step 3 ：Modes: 17, 18
