NikoliaF734353 NikoliaF734353 31-10-2022 Mathematics contestada Here are the numbers of children in 10 elementary school classes.18, 19, 20, 19, 18, 17, 19, 18, 19, 18Find 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."