Select an empty cell where you want the mean to appear
Type `=AVERAGE(`
Select the range of cells you want to average
Close the formula with `)`
Press `Enter`
Example: `=AVERAGE(A1:A10)`
To average non-adjacent cells, separate ranges with commas, such as `=AVERAGE(A1:A5, C1:C5)`
To include only specific cells, list them inside the parentheses, such as `=AVERAGE(A1, A3, A7)`
