To do Alt + M U A on Mac in Excel, download and install Accelerator Keys, then press Option, followed by M, U, A.
Command: Average
This is how to do Alt + M U A on Mac in Excel with Accelerator Keys, the native ribbon and alt key shortcut solution for Mac users who get more done with Excel.
Alt + M U A inserts an AVERAGE formula in the selected cell. Excel automatically detects adjacent cells containing numbers and creates an AVERAGE formula to calculate their mean value. This is useful for quickly finding the average of a range of numbers without manually typing the formula.