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.
I am sure this is a military plane, can it fly so high radar can not detect it, at what height would that be(?) and one more thing, what part on a plane fails first when flying to high for any given particular plane that is not meant to fly so high?