Calculate a baseball player's batting average. Calculating a baseball player's batting average is not a difficult task at all. A batting average represents the percentage of at bats that result in hits for a particular baseball player. The formula is: That's all there is to it.
To fly under the radar means to act in a way so as to actively avoid detection. It is the opposite of 'in your face'. There is an element of getting away with something but it is not necessarily bad.
In other words, radar is a bit like the echolocation system that blind bats use to see and fly in the dark. Photo: This mobile radar truck can be towed to wherever it's needed. The antenna on top rotates so it can detect enemy airplanes or missiles coming from any direction.