Click the Birthday column and then click the Primary Key. The AVERAGE function does the same thing as mean. And there you have it.
In the excel template for 2 different sets of data we have found the sample size.
In the opening Combine Rows Based on Column dialog box specify the settings as above screenshot shown. Several functions let you calculate variance in Excel. First the AVERAGE function below calculates the average of the numbers in cells A1 through A6. Number2 to Number 255 optional is the additional data you want to include in the average calculation.