I think the answer is f(2)=6 , but I'm not too sure. Hope this helped somehow!
Answer:
C. 
Step-by-step explanation:
c
This answer would be (-14).
It is defined as the difference between the largest and smallest values in the middle 50% of a set of data<span>. To compute an </span>interquartile range<span> using this definition, first remove observations from the lower quartile. Then, remove observations from the upper quartile.</span>
