When working with data from a complete population the sum of the squared differences between each data point and the mean is divided by the size of the data set, i am a teacher and it says sort the data from least to greatest in the quextion you need to arrange the values first than solve the answer will be 8. To follow from forgetso's answer (which follows from the Law of Large Numbers), to shift your random sample so that it has the exact mean and standard deviation, you can standardise the values to mean 0 standard deviation 1 and then shift it to your desired values Suppose a 15 to 18-year-old male from Chile was 168 cm tall from 2009 to 2010. { "2.01:_Prelude_to_Descriptive_Statistics" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "2.02:_Stem-and-Leaf_Graphs_(Stemplots)_Line_Graphs_and_Bar_Graphs" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "2.03:_Histograms_Frequency_Polygons_and_Time_Series_Graphs" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", "2.04:_Measures_of_the_Location_of_the_Data" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass228_0.b__1]()", 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