The type of communication styles used by individualistic cultures which are very explicit, detailed, and precise are

I believe the answer is: Low-context communication style

Culture that rely in low-context communication style generally had to put as much emphasis to word-per-word meaning to truly make other people understand one's intention. 
Even though this might lower the chance of misunderstanding, people in this type of culture usually do not really value things such as  comedic intention and sarcasm

The median is 4 because 2 x’s out 9, 3 x’s out 7, 3 x’s out 5, and 4 is the only remaining number.