The GEOMEAN and HARMEAN are advanced statistical functions that typically require a deeper understanding of mathematics. This is probably why they aren't taught as often as the AVERAGE function.

A rising tide lifts all boats. Adam Parkhurst discusses how to create a culture of improved standards in your fire department ...

Learn what residual standard deviation is, how to calculate it in regression analysis, and why it's crucial for measuring predictability and goodness-of-fit in data modeling.

If you correctly recall the elementary trick for order of operations, solving this problem should be a breeze.