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@@ -165,7 +165,7 @@ NumbericColumn has many more aggregate functions. For example, to calculate the
double stdDev = nc.standardDeviation();
```
-> **Key point:** NumbericColumn supports many aggregation functions, including many of the most useful. Among those available are *sum*, *count*, *mean*, *median*, *percentile(n)*, *range*, *variance*, *sumOfLogs*, and so on. These are defined in the [NumberColumn](http://www.javadoc.io/page/tech.tablesaw/tablesaw-core/latest/tech/tablesaw/api/NumericColumn.html) class.
+> **Key point:** NumbericColumn supports many aggregation functions, including many of the most useful. Among those available are *sum*, *count*, *mean*, *median*, *percentile(n)*, *range*, *variance*, *sumOfLogs*, and so on. These are defined in the [NumericColumn](http://www.javadoc.io/page/tech.tablesaw/tablesaw-core/latest/tech/tablesaw/api/NumericColumn.html) class.
>
When we discuss tables below, we'll show how to calculate sub-totals in one or more numeric columns by the values in one or more grouping columns.
