Select an empty cell where you want the mean to appear
Type `=AVERAGE(range)`
Replace `range` with the cells you want to average, such as `A1:A10`
Press Enter
Use multiple ranges if needed, such as `=AVERAGE(A1:A10, C1:C10)`
To average non-adjacent cells, include each cell or range separated by commas
To ignore blanks and text, use the `AVERAGE` function as it does automatically
To calculate the mean of filtered data only, use `=SUBTOTAL(1, range)`