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.
drop off the radar. To be ignored or forgotten in favor of something more important; to fall into obscurity or disappear from public view. When the economy crashed, many social welfare projects simply dropped off the radar. The band had a hugely popular single in the 1980s, but they dropped off the radar soon afterward.