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.
Radars are frequently used to identify distance and speed, such as how far away an object is or how fast it is moving. A radar device emits a radio wave, which moves at the speed of light, and bounces back to the radar device when it encounters an object in its path.