Select the 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 `=AVERAGE(A1:A10)` to calculate the mean of values in cells A1 through A10
Use `=AVERAGE(A1, A3, A5)` to calculate the mean of specific cells
Use `=AVERAGEIF(range, criteria)` to calculate the mean with one condition
Use `=AVERAGEIFS(average_range, criteria_range1, criteria1, …)` to calculate the mean with multiple conditions