How did we get an answer of 15.4 in the first project?

Nadia, an intern in a restoration firm, collects data for 3 projects involving the remodeling of an monument and sends the collected intormation to Maria, her supervisor. Maria uses this data to select one of the projects. (Hint don't forget the standardization step) Which project Maria should select? The score of pioject 1 is The score of Project 2 is The score of Project3 is